I don't think Kaepernick after leaving the 49ers was really serious about ever playing football again. The NFL called his bluff multiple times and each time he either sabotaged it or made up some excuse why it didn't work, and then didn't even consider playing elsewhere. We'll see with Flores, I think you're right at least in the short/intermediate term he's done in the NFL but I could see him re-emerging in one of these USFL/XFL-type leagues or the lower college ranks if he actually does still want to coach.