Not sure what you consider a long wait.
But heres something to think about,
I was looking at the wait times on the app today, and 7DMT had a posted wait of 40 minutes at 9:07 this morning. Park opened at 9:00 with no early EMH today. Since then it has steadily gone up from there all day long. It is now listed at 160 minutes. Actually, scratch that, while I was typing this it popped up to 170 minutes. As I am not at the park, I have no way to verify this time is accurate. Disney tends to exaggerate their times a bit. However, even if they are off by half that is still over an hour wait. Take it as you will.
I would think it shouldnt be quiet as bad the end of next week. Today is a higher crowd level day because of the holiday weekend. However, Id still expect long lines all day for this ride. It looks like unless you are willing to be at the park an hour early and in the very front of the rope drop crowd, even arriving at rope drop, isnt going to prevent a wait of 40 minutes or more, but it might avoid a 2 hour one later on.
Best advice is to keep trying for someones cancellation. Also, try the single person copy and paste method, or the overlapping times method. Dont only try for a 4 person reservation. I know people have reported luck finding FP+ for their families by selecting a different overlapping time window for each member.