Yes that is the stat that has to improve, but I think it just might. One thing you have to give Ryan is he really works to improve his weakness. His rookie year he was really bad in the redzone, last year he was MUCH improved. Last year we finally got him a deep threat and he wasn't great at getting on the same page with Wallace deep, I think this year is the year where THAT was his biggest issue to work on in the offseason. Lets hope he has the same type of improvement.
On the flip side of that equation however, is I don't know how many QBs make huge strides at getting better throwing deep. Some say that you either "have it" or you don't, when discussing throwing deep. I haven't seen any stats of QBs making huge strides in that department or not. But I think we can all say if he has more time/better protection, it would have to help in that area. I do know throwing deep was also an issue in college. So it wasn't just the lack of protection last year, but he still has many years to get better, let's hope he gets it down this year.