1) The anime has always been aimed at children and anyone who expected the anime to become grittier and more mature as they themselves grew older is foolish.
I could care less about the grittier and more mature bit, but what I DO ask for is that they at LEAST attempt to make sure Ash actually succeeds in his stupid goal, actually GIVE a clear and concise statement of what his goal entails, and actually have him age so that, at the very least, him actually travelling from region to region comes across as plausible (I mean, for goodness sakes, it's a Rocky Balboa-esque show which makes aging somewhat inevitable). That, and at least having main villains who actually ARE threatening enough to actually make them a worthwhile antagonist, more than Team Rocket, I should add.
2) Ash originally had no intention of going to school but because Alola had already sorts of Pok?mon decided to stay there. Frankly a school, while under utilised right now, was a much welcome break from the repetitive jarring format of travelling from A to B.
Problem is, Ash already proved, multiple times, that he didn't even NEED to go to school in the first place anyway (as early as The School of Hard Knocks in fact). And for the record, him actually overseeing the development of a league would have been just as much of a welcome break, and a far better representation of Ash's growth than him being forced into a school environment and, until now, wasn't even allowed to pursue his goal.
3) The art style was primarily used to allow simpler movements for greater fluidity of animation. This is evident in not just the Pok?mon battles but also between the humans. Subjective, but by no means 'bad'.
It's not like they can't create smoother movements with the old animation style. Heck, Disney films had a lot of really fluidity and animation, and they generally looked much better than SM's art style.
4) The story is likely to kick into effect next episode but we also have some other storylines such as Tapu Koko interest and Lillie's fear. It seems like a few storylines are being dropped as the writers experiment with certain things.
To be fair, Lillie's fear's largely been resolved with that Alolan Vulpix, and besides, it's probably going to get a bit more focus now that her mom's entering the picture (and if it's anything like the games, she's probably going to have a similar role in her daughter's fear as well).
5) Characters are highly subjective and the only ones I expect much from are Lillie and to an extent Ash. The others seem to be a supporting cast and I'm OK with that, even if they have smaller goals than 'Pokemon Master'.
Eh, to be honest, Lana and Mallow at least have goals comparable to Ash's (and believe me, compared to Ash's goal, Lana's goal if it's anything like Misty's goal is a LOT more defined than Ash's goal ever was.).
If I was being honest with myself, I would gladly take the SM saga and it's 'crappy art style' over the sexist piece of s*** that the XY saga gave us.
Well, I can agree with you that XY wasn't exactly good especially regarding Serena (and personally, I thought May and Dawn were about as bad if not even worse. If anything, the only female characters I actually did like were Iris and Misty.). However, I will mention that the only part of XY I actually DO like was the fact that Ash was actually depicted as a seasoned pro, not to mention showing the Gym Leaders in a better light compared to AG, DP, and BW (still not quite to OS level, but certainly closer to that than the other three shows).
I doubt that SM will last two more years because the Nebby-arc starts and they said in the E3 itself that it can be that new game can last over a year, with other words SM will most likely end in November / December 2018. A good indication of this is what was said in the E3 they rushed the Akala Island and now the Nebby-arc begins.
We'll see. Don't forget we still have to worry about Ultra Sun and Ultra Moon, so even if Sun and Moon will be outdated by that point, we'd still have a ways to go before Generation VIII comes out or is even announced, and that's ASSUMING we even get a Generation VIII anime by that point considering there's the likelihood that Ash will actually WIN the league, marking the first time other than Orange Islands that Ash has actually WON a league and probably mark the end of the series.