So many good points why this will most certainly be in the AC. It also used the same structure. Monster's Inc would require demolition and new exterior construction either way. So, it's definitely a different situation.
Let's mention another that I haven't seen mentioned yet: height requirement.
Does it make sense to remove MV, in this park with limited whole family attractions, for a roller coaster?
They'd be better off relocating the dark ride from DCA, in that case. As the parent of a toddler, DHS needs more attractions for those under 40 inches.
Losing the AC/SW:LB isn't much of a loss and the Disney Jr show can be relocated.