Poor guy. Nobody should have to go out like that. Hopefully he gets out one hit too early rather than one hit too late. I'm sure he's going to be ok financially, but concussions are scary. They are so easy to get subsequent concussions. I remember talking to Steve Young right as he was going into his last NFL season. He just seemed confused. He's made big strides and improved a lot...but it hasn't been an easy road.
There was a guy that I went to school with and he lived a couple of apartments over named Dustin Johnson. He was on the Seahawks after he played at BYU and he was set to be the starting fullback. He got a severe concussion in the last preseason game, and ultimately had to take an injury settlement. When they did a brain scan, they found a lot of damage and actually had to go in and relieve pressure on his brain. He had formed a non-cancerous tumor on his frontal lobe I believe, and it was identified due to his feeling increasingly sick and disoriented prior to the helmet-to-helmet knock he took in his last game for the Hawks.
The scary stuff happened later. He ended up living in the neighborhood where I taught and had bought a home with the cash he got on his settlement and then started a business with the help of Itula Mili (who was still with the Hawks). This supported Dustin and he's done ok financially, but physically and mentally he has struggled. He gets lost easily. Thankfully he has a great support system in his neighborhood that helps him to get things taken care of. Nicest guy in the world. To see a "real person" get it and struggle mightily is quite a life changer in how you view things.
Hopefully Kolb gets out and was wise with his money for his own and his family's sake. Guys want to maximize their money and play to set up their families for life and such, but don't die because of it. I think he's a pretty smart guy and will likely get a broadcasting job of some sort (they seem to be a dime a dozen for former players that are interested, especially QB's because of their unique perspective).
I do have to concur that Buffalo was a bit silly in going with only 2 QB's, one being a rookie and the other being a guy who has been concussed multiple times. Not smart roster management. My guess is Leinart will be starting week 1 with maybe 7 practices under his belt.