Obama should agree to the penalty originally outlined in the DNC rules - 1/2 of pledged delegates sanctioned and no superdelegates seated.
I doubt he'd ever agree to that until either:
1) It's clear that he's going to win both pledged delegates and popular vote regardless, or maybe:
2) It's part of a package deal regarding a resolution on Michigan.
The problem with Obama agreeing to a 50% cut in Florida delegates now is that it legitimizes the Jan. 29th Florida primary as being, even in some minor way, a reflection of the will of Florida voters, which is problematic if Obama wants to claim some kind of "popular mandate" by winning the pledged delegate count and the "popular vote minus FL & MI". What if Clinton manages to catch up in popular vote once you include Florida in the calculation? There's no reason for Obama to take that risk by agreeing to count the Florida primary in any way....unless and until it becomes clear that Florida wouldn't change anything.