^ They don't have to dismantle SSE to remove the tracks or any other part of the ride. It's a 180 foot diameter geosphere, it's ginormous. For all we know, and what I believe, the track work will remain the same, just refurbished. Most of the work will probably be the redesign of the sets to fit the new theme, and a new train.
I'd think if most of this work is being done after park hours, the monorail can stay in use, without going to shuttle mode. I don't recall, did they have to go to shuttle mode when the wand went up?