Interesting. As a 'West Coaster' I'm watching with interest to see if DL does the same with Hallowe'enTime and the Oogie Boogie Bashes. I haven't seen anything 'official' either way.
With my planned trip to DL this summer being a no-go, I was wanting to reschedule for the fall. But HTime is hellaciously crowded and I generally avoid it. If they cancel the OBB parties it may cause crowd levels to drop and make the idea of going then a bit more palatable.
The canceling of MNSSHP I wonder if there will be a 'lessening' of crowds at WDW in Sept/Oct.
CAVEAT: This is all assuming that by then the restrictions on the number of guests in the parks has either been lifted or greatly enlarged.
Cancelling MNSSHP was the final nail in the coffin for us. We cancelled our stay at FW from Oct 10-17. Planning on rescheduling to next June when reservations go live again.