I am almost positive the Steam Deck 2 will be the same design with upgraded hardware, maybe additional USB port or something.
Valve put a lot of RND into the Decks design and ergonomics. I think it would be a waste of money to change it. Money i would rather them use towards an OLED screen or something.
Portable gaming Pcs. I would love to have my entire library of games accessible offline. My emulation folder alone is like 500gb. I also wouldnt call myself a normal user though. These definitely have a niche market and probably a price tag just as niche.