There is a groundwork for Sentry rarely showing up in future movies. I imagine we'll see him again but if you bring him out, you risk the Void, so they may just bench him for a while.

Hasn't Marvel been toying with a World War Hulk? Sentry's best episode ever was against Hulk in that story (spoiler: he fights Hulk to a standstill until they both revert to their human forms and Banner kills Bob, which prevents the Void.), though he's had an epic fight with Thor as well (Sentry begs Thor to kill him).

I did have a beef with the Sentry suit, it looked like a cheap Halloween knockoff, but that makes sense since it was a PR stunt orchestrated by Valentina.

Mostly this sets a great, movie-friendly precedence for Sentry. When deployed, he's (likely) stronger than anyone we've seen so far, but then his Void is truly unbeatable unless you can soothe Bob inside the Void, at which point he forgets everything, undoes the Void's damage and reverts to Bob. Really only Wanda has a chance against him, but Bob wants to be benched, so we will probably not even see him for a few movies.

Sentry's already confirmed (along with the rest of the team) to be in Doomsday, so I wouldn't be shocked if they have to go to him with the threat of Doom incoming. And then Doom does something Doom to just completely neutralize him.

You can only beat Sentry/Void psychologically, which is a Doom special.