27 is getting pretty old to try and make a comeback.
It's not as if the NFL is teeming with superstar QBs.
Once you get past the top tier of QBs like Brady, Manning, Rodgers, and maybe a dozen others, you still have better than half the NFL teams that are searching for a reliable starter QB.
So there will be a lot of spots open for Tebow to compete for. I wish him luck.