I would like to see that . May isn't my first choice, but as my second favorite girl of pokemon i would more than welcome character getting its own set of specials. Her leaving after Wallace Cup left many things open and unanswered about her future growth as coordinator, how far she came in Johto Grand Festival, to what region she headed afterwards etc.
It definitely had potential to make interesting storyline out of it, and seeing some of her rivals again in action like Drew and Harley would be highly appreciated too. Judging by huge improvement she made as coordinator when returning in DP having already 3 ribbons and bunch of evolved pokemon like Venusaur, Wartortle and Glaceon i wouldn't be surprised if she even went all the way winning GF without us even knowing. And we will probably be left in dark on that regard unfortunately, unless she appears again.
Than there is also fact that she has two pokemon capable of mega evolving(Venusaur and Blaziken). Potentially three if Wartortle evolved seeing her trying to unlock secret power of her pokemon putting to good use everything Ash and rvals taught her.
Because while you could argue how mega evolution isnt necessary for contests which focus more in beauty and elegance of attacks in leaving good impression on judges. Theres also fact how May was always more similar to traditional trainers in choice of attacks and more raw, direct approach in battles relying on strength and resistance.
Which often took her opponents of guard working both for and against her.
It would be cool to see her trying to reconcile massive boost in strength her pokemon receive from mega upgrade with glamour in trying to use it to her advantage in attempts of becoming top coordinator making name for herself out there.
Not to mention with ORAS remakes out there, writers could use May to promote this games further, By making her one of star characters in new set of chronicles being perfect candidate. Since she is actually female protagonist of third generation.
Fixing lack of respect writers give to her and any ditched main characer in pokemon main anime pretending like they dont exist along with their unfinished stories. Which is sad.
It wasn't that the writers didn't want to do chronicles, I think the main reason was because that no one really liked them. One reason being because it wasn't the main season.
I dont know where you heard that, but its not true, Chronicles got just as high or even higher ratings than Hoenn episodes which aired at that times. Ratings are in here:
Episodes marked with red star represent them.
https://pokeani.s47.xrea.com/s-title/subtitle-hoso.html
In addition DP specials taking place in BW series got rating of 7.1 which was pretty respectable ranking during that era:
https://www.animenewsnetwork.com/news/2011-02-14/japan-animation-tv-ranking-january-31-february-6
Reason why chronicles stopped airing isnt clear and fully known(it has something to do with specials starting to be run in different timeslot on different day) . Accompanied with staff members at higher positions of pokemon company presumably not having motivation to warrant their continuation.
But it definitely wasnt because of "low interest"(interest was actually pretty big and fandom demand to see new adventures of Misty, May, Brock, Dawn etc. yearning for years for more only further proves this).
And I don't want to get too far off topic, but Famon, what would Misty do? She is a gym leader. All the episodes would be about was facing challengers. Although I guess it would actually be pretty awesome to see her go around trying to catch all water types, but that would get extremely repetitive, although pokemon is usually good about that.
Who says Misty would need to be at gym all the time? She took gym and stayed because of sisters incompetence not having anyone to rely on and freely travel to advance dreams, remember?
Writers could focus on Misty manging to make her older siblings start taking up their responsibilties. Introduce her parents which according to writers are alive, but abandoned daughters. Famon idea of gym leader tournament seem original too.
Misty ultimate goal is to become water pokemon master, so we could see her go on journey to enter tournaments with stronger trainers with Whirl Cup confirming how in order to reach water master title you need to win such competitions. Catch new cool pokemon(like Swanna, Milotic, Jellicent, Clauncher.). Maybe even Surskit discovering its half bug offering lot of room for growth in trying to get over her prejudices going through emotional disteess and struggle.
We could see her go on quest to collect key and mega stone to mega evolve her Gyarados.
Try to prove herself to renowned water specialists teaching her how to use water pokemon to full potential having to pass tests to prove she is ready for next step. Preparing to train with either E4 Siebold(who is water master) or idol E4 Lorelei on maybe Seafoam islands. With Lorelei preparing her to take her place one day as first E4 female using water types(E4 are marked as type masters in games, which Misty strives toward).
Etc, etc.
Possibilities are endless to do logical progression with character.
EDIT:
My apologies for links not working properly. I fixed it and now for those interested in ratings can see how original set of chronicles fared at that time in competing for viewers attention.
Hope it helps. :)