..here's what my contact had to say about this...
"That’s some interesting information, yes test and adjust has been going on for a year but has only been testing 10 to 12 hours per day it’s now testing 24hrs per day for the last few weeks. Capacity for AL will be around 4000 per hour. Bird will be around 3200 per hour, these times are based on the actual “ride time” that’s from the moment you actually get in the seats. Most rides average 3-5 minutes except for small world 15 to 20 long and boring minutes. The mark twain has a shorter ride time than small world, I’m one of the few people who sets a stop watch. Mansion at full capacity 3 per seat is around 3200. As far as the fear from other CM it’s because of the uncertainty of a new land, it was the same fear when toon town opened and cars land. Some of the concerns are valid but the other CM are too much in their comfort zone and don’t want to give up their days off because of an attraction change. So the statement is a yes and no statement and the logistics will be challenging.
WDI has a massive team their own office building across from DL and inside GE , if it was a huge mistake to do GE and Shanghai Disney, Disney company would be out of business right now. And more changes will be coming soon to tomorrow land including marvel at DCA which may or may not be a gamble "