...I do think there's a serious threat that ABC might get desperate to do a tawdry spinoff without the creative team, which is the best argument I can think of why the existing creative team should pre-empt any such travesty by doing one of their own.
Better scenario: that ABC continues their quixotic attempts to replicate the success of Lost by imitating various aspects of it and creating shows inspired by those aspects. Wouldn't have anything to do with Lost but if they keep trying, they might actually come up with something decent eventually.