Basicly the problem right now for Kevin Johnson isn't coming up with buyers, but putting an orginized bid on the table. Individual billionaires tend to want control over whatever they purchase. I don't think your going to get 4 or 5 billionaires, or multi-millionaires together and on the same page. Johnson has to show up with one good bid for the team that has reputable backing, and perhaps some negotiating room. This could be a tricky situation because at some point, you could have them bidding against one another, and thats not what you want. Anyway, he has his work cut out for him.
Nice problem to have though, several wealthy people all wanting the same thing the city wants.