Great games, the later ones lost their way a bit, but 1 & 2 were awesome.
The Monkey games and many others run on the
SCUMM engine. If they've ported that the 360, we could get everything from Manic mansion and Loom through to Indy, Full Throttle and The Dig.

No more work required, (unless they want to update the GFX) just plug the data files in.
I've used
SCUMMVm on my PC and DS, it's an open source version of the SCUMM engine. That runs
all these SCUMM games.
I'll just point out a few non-LucasArts ones that may raise some interest:
Beneath a Steel Sky
Broken Sword
Broken Sword 2
Lure of the Temptress
Simon the Sorcerer 1 & 2
King's Quest I - IV
Leisure Suit Larry in the Land of the Lounge Lizards
Police Quest
Space Quest I & II
The Legend of Kyrandia
Leather Goddesses of Phobos 2
They'd be making money for nothing on these old titles with little or no conversion work required. I'm sure a few of them will appear on XBLA.