17 game schedule, one extra bye week. That way every team gets a neutral field game each year.
The nfl gets 16 games a year to put wherever they want, and nobody loses a home game. They could have 4 in London, 4 in LA, a couple in Mexico, one in Germany and Japan. Maybe a regular season game in Hawaii or Las Vegas, and wherever else they want to play a game.
Plus there would be 2 more weeks of nfl.