I’m kind of torn on whether we’ll see Megas or not. I think there is a good chance they will show up in BDSP because it is one of the more popular gimmicks. It has shown up in the anime again, but I’m not sure if its because there are Megas in Pokemon Go or if they’re planning to have it return in the mainline games.
I'd like Megas to return but I'd be quite surprised for them to return and that not be a majorly advertised feature given how popular it is
Plus its fairly prominent in Masters too.But they’re not dead. They’re very prominent in PoGo.