Well, I think everyone is overstating the importance of a running QB in Kelly's system. Dayne Crist only ran the ball 4 times a game, when he was healthy. If you look at Cincy's offensive numbers, from the Kelly years, Cincy's run/pass ration was almost exactly 50/50, every year.
Cinci's run/pass split was only 50/50 under Kelly if you factor in QB runs as well. Taking those out, it was closer to 40/60.
Again, while Rees is certainly no Tony Rice, he's not Bernie Kosar either. Being able to move around a bit, and extend plays, IS important. But that can be developed.
I think this is where you're in the minority. Most of us believe that acceleration, foot speed, etc. are not things that can be easily improved, and even then not improved upon significantly for most people. Rees is the least mobile QB on our roster by a pretty large margin, which prevents our offense from running a lot of very effective spread option plays which would make us far more dangerous in the red zone.
Rees is a lot closer to Kosar than Rice, and in Kelly's offense that's a significant limitation.
I'm not saying that Golson or Hendrix WON'T overtake Rees. But I am saying that it's not a GIVEN, like a bunch of people seem to think.
I don't think it's a given, but I think it's more likely than not. Rees could turn into the next Major Applewhite and hold off the more athletic QBs with outstanding accuracy and ball security, but assuming that doesn't happen, Hendrix and Golson are bound to sneak up on him. The advantages he enjoyed last year-- (1) having run the spread in high school, (2) early entry, and (3) lots of game time snaps-- will become less pronounced as his competitors get more time in the system.
In other words, Hendrix and Golson can learn Rees' quick release, poise, and knowledge of the offense, but Rees can't learn to be a mobile QB. It's his physical limitations that will make it difficult for him to hang onto the #2.
So Longo is going to make everyone on the team stronger, but Rees' arm strength is going to stay the same?
If we can take Molnar at his word, Crist can only throw the ball a few more yards than Rees; I suspect the arm strength knock on Tommy is probably overblown.