There's pleanty of AI poker games out there and no1 said i has to be perfect.
Bethesda should just cut a deal with "x" AI poker game developer. Slap that code on some NPCs and we've got Poker in New Vegas
The NPCs could also be restricted to just the poker table. I know it would be kinda lame but that would simplify things.
It could also be very complex and intersting like bringing a companion to the table... or some of the other things mentioned.
How cool would it be if you could cheat too ha ha