The problem is that the SW attractions have nowhere near the capacity/throughput of EITHER LMA or Backlot tour and will have much greater demand.
It's not just capacity/throughput. You need to account for the 2 hr line. Consider FoP. It goes through 1008 FP+ per hour, and 432 standby's. Say each FP+ is 15 minutes, that's 252 guest-hours per hour. Say each standby rider waited 2 hrs. That's 864 guest-hours per hour. The other way I look at it would be the FP+ queue would have say 252 people in it (15 min worth), while the standby queue would have 864 in line. That ride would have 1116 guest 'occupied'. Consider Muppet 3D running at OHRC of 900/hr. Say the show is just at capacity - minimal wait. It's 15 minutes, so it's occupying 225 guests at once. Roughly 1/5th FoP.
Crunching #'s for March 27, a 10/10 versus 3/6 a 6/10 at MK. I looked at 7 rides, Big Thunder, Peter Pan, Space, Splash, 7D, Jungle Cruise & Haunted Mansion. The
difference in my calculation for average number of people in line for those two days is 506, 162, 540, 351, 408, 243, 360. The wait times were taken from touringplans observed waits. Peter Pan doesn't help a lot, even though its wait went from 75 to 120 min, mostly due to its low capacity which is 1/4th of Haunted Mansion. Haunted Mansion going from 50 min wait to 75 absorbed 360 guests. 7DMT has roughly half the capacity of Haunted mansion, but it absorbed more guests because its lines went up by 55 min vs. 25 for HM. The big absorber is Space Mountain as it's got the highest capacity of the 4 thrill rides at MK, and its line went from 100min on a 6/10 to 160min. Big Thunder absorbs a lot of extra guests because its wait went from 45 min to 120 min.
My argument is that you can replace high capacity attractions with lower capacity attractions and keep the same guest absorption rate as long as those lower capacity attractions maintain long lines. Would you rather wait 120 min for a ride at Galaxy's Edge or ride Great Movie Ride 3x?
The other thing is that, from what I've heard, they don't want the lines from the rides clogging up Galaxy's Edge the way they have Pandora. Somehow they'll limit it to what they can hold in the attraction buildings, route the standby queue's out of the way, and/or cap the number of guests in Galaxy's Edge at once.