I have a few thoughts on this:
1) This isn't even going to be even remotely possible. I think you'd have to half an entire division in Europe.
2) Logistics nightmares aside, I'm not convinced that the UK is ever going to adopt football to the degree that this would be lucrative. You could fill up Wembley Stadium every year when the circus comes to town, but do you expect Londoners to live and die with a team? I wouldn't. The EPL isn't going to put a team in New York City (or Tokyo or Mumbai) because it's an attractive market. Because they're aren't enough soccer fans to make it worth it. I mean, London couldn't support an NFL Europe team after 1998. Seriously.
3) I think Robert Kraft should keep his big, fat trap shut. Not only would he never consider moving his team, he would never even consider giving up a single home game to expand the Patriots' international presence (not to mention a possibly offensive mascot, if you think about it). It's just another case of big market owner's trying to bully small-market fan bases. Using London as a stadium scare-threat to eventually replace Los Angeles. That, or hyperopia.