I can tell you guys right now that, personally, I want less than nothing to do with an NFL franchise in London. The Bills are my team, I didn't start following them because of a convenient location.
That being said, I think the current government is working hard to secure that as a long-term venture and I agree that Jacksonville makes a lot of sense because of Khan's ownership of Fulham etc. I think it's a logistical nightmare and, while moves to LA and Vegas are pretty soulless ventures for nothing more than financial gains, a London franchise would be the straw that breaks the camel's back. Quite rightfully, US fans should be universally against it (sans a few Jags fans that want them to move so they can stop caring).
As for us being "suckers for any American cultural product", both Yanks and Canucks come in their droves to visit an old woman living in a fancy house. Talk about throwing stones in glass houses