It's not that I think Kuhn couldn't play (as in, "done for good"), its that if Ripkowski is good enough to make the final roster (and not be targeted instead for PS), I don't see a reason to keep Kuhn. I think Kuhn was signed as a safety blanket, in case they were not able to finds a young one this year. But they did find one, and if he proves to be ready to play, Kuhn isn't needed.
In what areas could Kuhn be expected to contribute this year?
- Special Teams - any of a number of younger guys will be better, as Kuhn has fallen off
Lead blocker - Ripkowski's strength. Scouts said he will "wow" you at least once or twice every game. If he is ready to take these snaps, I think Kuhn is gone.
Short yardage - GB has better options with Lacy, maybe Ripkowski, maybe the (big) 3rd back they keep.
Third down - Lacy is growing into this role as both a receiver and a blocker.
Pass situation extra blocker - Quarless or another TE, Lacy, maybe Ripkowski are options; but this might be the one situation where Kuhn still provides increased value.
If Ripkowski is ready to take the brunt of the load as a blocker in the running game, I think there will be reasons to keep other younger guys, not Kuhn.