I suppose it is my fault for wanting to see logic in the posts I read, even from the Rockpile 007's of the world.
Much of the JP conversation seems to me to be at cross-purposes. I think it is quite likely that someone will sign JP, which does indeed create the possibility that he will play again (even Todd Collins did, after all, though he went a few years between meaningful snaps, if I remember correctly). Just as David Carr and Joey Harrington and Byron Lefetwich have been able to find work, JP will likely find work too. That does not mean, however, that it is just as likely that JP will be viewed by anyone as a future star, or that anyone will sign him to be a starter. I consider that to be much less likely, considering that JP did not have a very strong following among NFL analysts even when he was a starter.
In less complicated terms, I will say that it is much more likely that JP will be another Todd Collins (find a job, be a backup, maybe play a bit here and there) than another Daryle Lamonica (who was recognized as a potential star when he was with Buffalo, and showed it when he went to Oakland).