You know what would really be great?

If megas were introduced gradually over the game's lifespan rather than all at once at the beginning. It could be every battle spot season which is roughly 2 months which would be perfect since megas are mostly designed for battling. To my understanding other strategy games and TCGs have similar things and it keeps the game fresh and interesting, and especially with there being no game this year, ORAS is going to be stale for a while longer than usual. The best we get is random eventmons but they don't quite have the same impact as new megas.