I for one hope they just don't do it. I want full reboot none of the old actors honestly. WandaVision and the care and effort they took to craft great characterizations of not only Wanda and Vision, but Agatha, Monica, the early days of Wiccan and Speed.
It's the exact reason I wanted the X-Men rights to go back to Marvel. I would LOVE to get that much attention and care and effort into our favorite mutants. Wanda and Vision have the best love story, relationship of all the MCU now.