Nothing, really. It's not so much Roski as his proposal, which is already approved and uses no public $$. All prior stadium proposals in LA have failed to get very far, even with involvement of such monied interests as Eli Broad and Michael Ovitz. That Roski is proposing a privately financed facility -- one that already has been approved by City of Industry council and voters -- means that he's already most of the way there. Plus, he built our Staples Center (where the Lakers and Kings play), so he's done it before.
Perhaps I'm being too optimistic. I've been known to suffer from that fatal flaw, esp. as concerns NFL football in LA.....