For me it would be awesome if the construction were running behind and delayed the closure. But I guess there is so much going on away from the 3rd theatre that nothing will stop or delay this rehab. It is what it is.
Seems like most any time, there is always at least 1 headliner down somewhere at WDW.
They're updating the queue, too, hopefully adding interactive elements for the long waits. Disney would rather close down for a few months than have guests walk under tarps or by a piece of unpainted plywood - it can be frustrating while you wait, but it's what sets them apart.