What the future holds for Vision in the MCU is unknown. He could also appear in other projects, such as Armor Wars. However, it's probable that he won't be seen again for a while.
The cancellation of Vision Quest is a reminder that Marvel Studios is not afraid to cancel projects, even if they are highly anticipated. This is because Marvel Studios has a very high standard for quality, and they are not afraid to scrap projects that they don't believe in.
Fans can always express their disappointment to Marvel Studios on social media. However, it is important to be respectful and to avoid sending any negative or hateful messages.