I doubt it will happen. The game time won't line up right.
NFL likes to have the game run in the Sunday early evening prime time slot. About 5:30-9 here in the Central Time Zone.
6:30-10 in the east and
3:30-7 in the west.
In order to get the same viewing time for a game in London they would have to kickoff at 11:30 PM London time. If the game started earlier say 7 pm London time it would be 11 AM in Los Angles which would defeat the purpose of having the larger night time audience.
As for the NFL making more money in Lodon, maybe they could. It doesn't seem like they are hurting to much in that area with the games played here in the States. Those tickets are pretty expensive here too.