I'm talking about rational people, not idiots who feel betrayal because someone goes to work for another company. I'm sure it has a lot to do with what you do or the circles you travel in, but my experience is with globalization team loyalty is something very few hold on too. You like a player, who cares what team they play for, jerseys can be shipped anywhere. Remember that, we want players to have fans everywhere!
Sure I've met people who never had an NFL team and fantasy sports/wagering of money have brought them to the forefront. I've met college fans who follow players at the next level, but again, they never had an NFL team or didn't like the NFL game enough to follow it closely.
from Maine to the Florida, even spots I've been out west, the entire basis of NFL fandom has been built around teams....
Any bar is a great litmus test for every person you find that jumps ship when a player leaves a team there are 10 more who stick with a team over a player leaving. Completely rational people too.
Obviously people have favorites they pull for when their team isn't playing, but again, team first/player second. Most NFL fans don't jump ship on teams just to follow a player that leaves..