I think Microsoft needs to be more proactive on getting games onto XBLA. I've had plenty of great XBLA experiences (notably, Jetpac Refuelled, Pacman CE, Rez, and Puzzle Quest) but there is tons of stuff that the community (aka me) has been dying for and not getting.
Notably? I would pay $10+ for the following: ChuChu Rocket XBLA, Power Stone 2 XBLA with online gameplay, old Saturn vertical shmups, Panzer Dragoon Saga. Screw it, damn near anything that came out on the Dreamcast. I love new experiences as much as the next guy, but having multiplayer on Live for many of these games would just be amazing.
And they could use the money from these rehash games to fund new titles. Win - Win!