The movie won’t dictate what happens to the attraction now that it is built. Guest response, park ratings and demand will.
Even if they could be lightening fast and overlay it in 8 weeks (I’d assume 4-6 months to do it properly), there is no indication the attraction needs or warrants the investment. Nor could I see them feeling the need for something that is actually causing people to show up in droves at opening.
Millennium Falcon (aka an attraction more tailored around the film Solo), with more middling demand, and something that could be changed without taking it offline, is the far more likely candidate. Of course an entertainment package for the land itself.
But I don’t understand why at this juncture Disney would be stupid enough to redo a successful attraction.