At this point wondering about any character that’s come and gone in the MCU is kind of difficult since there’s so much coming up that trying to keep it all together and wrapped in a neat little package isn’t the easiest thing in the world. But with that being said, the fact that Paul Bettany doesn’t have a Marvel contract at this time might mean that we won’t get to see what happens to the Vision for a while to come since the white version of the android that made an appearance in WandaVision and fought the fictional, recreated version of the character was gifted the memories of the original, but then flew off without another word about where he’d gone or if there was going to be any use for him again. There have been a few Marvel characters that have just disappeared over the years such as the Abomination, Bullseye, who was seen in a post-credit scene in Daredevil, and a few others. It’s hard to think that with such a wealth of heroes and villain that Marvel would be reckless enough to let any of them go without proper closure, but if one thinks back to the comics, there were entire runs in which a character might not have been seen or heard from, and people eventually just let it go. Once the character did return, people were overjoyed to see them and expressed a great deal of gratitude that they were back. White Vision is bound to come back at some point, meaning that Bettany will undergo contract signing if he’s still interested, but for now, it would appear that the MCU is going to focus more on the shows and movies that are going to push the story forward rather than having to answer questions on where Vision has been and what’s going on with his character.