I see no good scenario where they wouldn’t completely gut the old showbuilding, expanding upon it like Cosmic Rewind did to Energy, or demoing and reusing it like GMR to Mickey. If they did it to the GMR, they’re doing it to Figment.
It doesn’t necessarily have to be trackless due to the abundance of them now in Orlando (how times have changed), but something on the scale and quality of Mystic Manor would do the original justice and is absolutely what Figment and Dreamfinder deserve.
The Pyramids are incredible to look at (my personal favorite architecturally in FW), so I hope they stay with whatever they do. I don’t know what would need to be kept structurally to allow them to remain, however.