It sounds temporary though, something to help this summer. They better add something else for Christmas and Easter next year if GMR will be closed before TSL opens. That's a lot of capacity lost.
I agree 24 months sounds unrealistic to get Mickey open, especially since GMR is landlocked during park hours. If they really wanted, they could start building behind Launch Bay right now, and then convert it to queue space once SWL is done. But that would mean actually expanding the park. Clearly the directive here is to close the attraction that is costly to operate, and replace it with something that only requires a handful of CM's and a ton of screens that are easier to maintain. I'm sure it will be a fun ride, but it comes at the expense of a classic. Shame.