I think you're right, I remember hearing that Indy and Arizona are probably getting new stadium deals, so a move by them is less likely. I dont know about San Diego, though.
I had thought Minnesota was in the same situation, but I did just hear about a possibility that Emmett Smith was thinking of joining an Arizona group looking to make a bid for the Vikes. I guess I could see that group buying the Vikes and moving them to nearby L.A. Losing the NFL in Minnesota would really suck, though.
I forgot about New Orleans, and I could really see that as a possibility as well.
Unforunately, I do still see Buffalo as the possible third team with Minnesota and New Orleans, particularly given the lease situation.