Not really, Kroenke is putting the pressure on the people of St Louis to build them a new stadium or they'll be off in a couple of years. Highly unlikely they'd end up in London but he does already have the Emirates stadium. The real fear for the fans is that they end up back in LA.
The game should go ahead because even if he ends up having to pay the stadium owners compo he's not really losing out as he's got the gate receipts from the Wembley game and plus the NFL pay ALL their expenses to come over.