As mentioned AAA support will see a big uptick but other games not so much since the Switch is already getting heavily supported outside of big games though early on there will be a big difference since the amount of indies in the first year should dwarf the Switch. Anything that runs on the Steam Deck will run on it and stuff that isn't quite there on the SD should also run on it due to its better hardware. It looks like the biggest issue could be the CPU so games that really push the CPU of the current consoles will be the most common ones skipping it which could make a potential GTA 6 port unlikely. It'll still get stuff like COD though which is huge.