I suppose there's still one thing, that gen 3 has, which ORAS is lacking and that is the Battle Frontier. So long as GF don't come up with a new game, that also features said battle facility, Emerald is going to have some worth of discussion that ORAS.
Also the thing with love and devotion is: you can love a generation and you can love the community of said generation, but that doesn't mean that you can devote yourself to said section in such a way, that you can keep it alive, by coming up with content that also drags in people who would like to be part of that section.
And lets not forget that a lot of features make a return in multiple generations, which makes posting a thread in PGC more accessable than posting it into a less frequented section. Sadly, that's something I had to learn while I was active in the gen 1/2 section.