The motivation would be to access a much larger area of Fantasyland. You could remove it's a small world and put in 3 major attractions that would more than double guest throughput on the same footprint.IMO, moving IASW would be a waste of money. Improve the facade so it's not a tacky tent and voila. The attraction is great and just needs a refurb, no changes needed.
This is also a very congested area of the park that can be opened up like the 2012 Fantasyland expansion.