Yikes. Poor planning on their part to not take care of the track problem years ago. Now we're in a situation, because when it does eventually happen, it's going to be taking a lot of capacity away from Tomorrowland, which won't be good considering the increased traffic due to Tron.
I know most people hated it, but maybe they should have kept Stitch around a little longer. Anything new in the SGE space will just be another draw to Tomorrowland, which would add to the capacity problem should a Space Mountain refurbishment happen.