It wasn't really under their breath. It was more like "Okay yeah we get it you want Pokemon for the Switch that ISN'T Pokken DX. It's coming please stop yelling at us"
Probably. Just like the transition from the DS to the 3DS this next game will probably be switch only to push Pokémon forward. Ultra moon and sun will probably be the last 3DS version.
Maybe a Pokemon game that combines all previous leagues and badges traveling the globe to achieve the ability to really "catch them all" it would be a long RPG but well worth it. And at the end you battle Ash who is an elder at the League with every badge possible.