Three thoughts.
1) "Soccer" is a global sport with a fan base in the billions. That fan base is increasingly moving into the money economy in places where it was mostly impoverished 20 years ago. The NFL would love to figure out how to tap into that, from a long term perspective. Sophisticated companies, especially Emerging Market based globals, are increasingly trying to figure out how to market to this demographic.
2) The logistics of a team in the UK or Central Europe are daunting, as others have observed. But there were those who said the same thing when the Dodgers and Giants moved to the left coast decades ago when transcontinental flights were a lot slower and longer than they are today. The logistics of having an NFL franchise across the Atlantic are no doubt much more problematic, but that does not mean they are insurmountable. BTW, too bad the Concorde has seen its day, as the three hours from Boston or New York to London was a lot shorter than even the fastest eastbound flights from the Coast.
3) The bottom line is that there is a huge potential market for the NFL product, but it will probably take a decade or longer to figure out how to make tapping it both economical for owners and reasonable for players. If the "will" is great enough, then a "way" will be found. Both the "will" and the "way" are now being tested and tentatively explored.
