spoilers:end of spoilers
I want Sam to get another book. But not as Cap.Giving Sam the mantel of Cap was what hurt him from being sustainable in the first place. As soon as he stoped being Cap the mantel of Falcon became an instant downgrade instead of a fleshed out role. When Steve was aged up in the books originally they should of just let Sam carry the shield in his Falcon garb for most of the run. If Sam ever whore the Red, White, and Blue in the comics it should have a been brief and mostly for symbolic reasons.
In short I feel Sam going back to Captain America would forever leave him in Steve's shadow. When the character had his own mantle that was important.