Game Lineup:
Nintendo currently only supports the Unity game engine. Unity is without a doubt the best 3D game engine on the market, and for high graphic games is almost a necessity.
2D on the other hand is different. In my opinion, GameMaker Studio 2 is the best 2D game engine on the market, and is perfect for the switch. If GMS2 would get support, then the Switch would immediately get games such as Hyperlight Drifter, and Deaths Gambit.
Hardware:
I'd like to see a Switch 2, but with the same form factor and just upgraded internals right in time for Christmas 2019 or 2020.
Entertainment/Media
First, I own an iPad, so my streaming needs are different. Although, Netflix, and a media player like VLC (multiple codec , and .x265 HEVC support) should really be a no brainer.