Even though Vision has died three times now in the MCU, there are still several ways in which he could return to the franchise. The most likely is in the form of the aforementioned rebuilt version of himself, who now has all his memories restored but seemingly none of the emotion that made the original Vision so humanlike.
In an interview with Esquire, Vision actor Paul Bettany addressed the potential future of The Vision and what he would be interested to see happen next, commenting on how his character has “never had a loved one to lose,”
“I guess we’ve seen what happens to Wanda when love is taken away from her. And I wonder what that would look like with Vision. I mean, that’s the thing, right? [Vision has] never had a loved one to lose…[he doesn’t] know what grief is because [he’s] never had a loved one to lose.”
When asked if he would be game to play Vision forever, Bettany responded, “I love Vision. Yes, I’m in.”