I say virtually no chance because I guess there is the very, very, very slim chance that at some point in the next 6 months there is news that Manning's career is essentially over due to complications of this neck injury and he is forced to retire prematurely.
I know just about as much about cervical neck/disc fusions as the dr's who diagnose and cut via personal exp's. This is SUPER serious, dangerous stuff he has going on. Bottom line, you shouldn't ever let them cut you if you can somehow either live w/ it or get to a slightly better place w/ it somehow via either p.t., neck injections, medicine...........but never the knife. The inherant prob is those three typically never work to solve the big issue. Ed Reed agrees w/ me on this, smart man. It is such a sophisticated, small area of your body, where everything is in a compact area, but think how dynamic the neck can move (w/o us being an owl). You screw something up in there, it affects EVERYTHING, let alone throwing a football. Your body is a willow tree of nerves, the spine is the epicenter, and his epicenter has been rocked. Not only can he probably not feel his hands/fingers, if he can it probably tingles (nice word, its damn painful) like your leg was asleep, expect it does that all the time.
Post surgery, typical nerve regeneration takes between 3-6 months under normal, good developing
circumstances. However, this procedure is anything but typical. Nerves are a complicated beast, and behave diffferently for most people. So typical isn't even a word that should be associated w/ this surgery. He basically had a spinal disc removed, whether it was buldging to badly, hitting/pinching a nerve, ruptured or simply torn or flattened, think a jelly donut w/ no jelly. That causes bone on bone spinal rubbing, right where your nerve epicenter is, so you almost can't not have nerve pain. Some surgeries are clean, alleviate pain and you're good after the nerves regen. I don't know a percentage, but I would wager over half have lingering, big time issues post cutting.