Every Marvel fan knows that Marvel is doing it in most of the movie, character who dies initially, somehow reappears later. As we saw in Captain America: The First Avenger, Bucky was supposed to die after the fall we all watched it but later in Captain America: The Winter Soldier he evolved as the main villain, the Winter Soldier. Agent Coulson was killed by Loki in Avengers but he again showed up in [Agents of S.H.I.E.L.D.](tag:722469) (TV series). There are more examples - Loki in Thor 2, Fury in Captain America 2 and Professor X in X-Men: The Last Stand, later appearing in [X-Men: Days Of Future Past](tag:203942).
Looking at the Marvel history there is quite a great possibility of his return. He is the only speedster in the Marvel Cinematic Universe and his powers are unique and impressive. Marvel can't afford to drop him.
We have seen that The Flash is one of most popular hero TV series. From the series we have seen the concept of creating and entering the wormhole using speedforce and going to past or future, we can expect Quicksilver coming from the past to the future as his powers resemble to Flash.