Really you believe these guys are franchise qbs? So the new norm is for a team to not only let one franchise qb walk but three. How many times has a qb hit free agency, went to another team and became a top tier qb in the league? I'm not saying it can't happen it's just highly unlikely.
Brees is the only one at the age of these guys that comes to mind but at the same time the chargers had Rivers.