Yeah I messed up my original math, but its not 52%, its roughly 34%. ($260 vs $400, for round numbers sake).
200 of 400 = 50%
250 of 400 = 62.5%
275 of 400 = 68.75%
300 of 400 = 75%
Even with those numbers, its still only a 12-15% reduction in room cost at max shutdown ($340-$350 a night)
You still get the EMH perk. You just can't get there or back (after its already been running for an hour, mind you) by monorail. If having the monorail for every other hour besides those 6 per week (2x2 MK EMH, 2 Epcot EMH) isn't worth the extra $140 per night, then its your prerogative to change.
But in reality, Disney should just cut monorail resort room prices by 6% per night while this is in effect. That is 3% per hour that the monorail could be running that a park is still open for EMH (or a party, I guess).