I have been back to the park 3 times since ROTR opening and have not been able to get on the ride... The boarding groups sell out way too fast... I imagine it will be years before this is actually accessible to the average guest... The park still needs more attractions...
I don't know what would really make it accessible. If DHS in theory had a dozen other new rides to "spread out crowds" it would probably also increase the capacity of the park, increase the number of guests in the park and still have demand outstripping supply for the ride.
Obviously, the biggest thing for RotR is for it to become as reliable as possible, hopefully that will occur with ongoing running of the ride. I think beyond that, the biggest thing to decrease demand might be if another big attention getting ride opened elsewhere on property (preferably not in DHS so it doesn't people to that park specifically) that would draw people away. But I don't see that in the horizon, not unless Cosmic Rewind is a massive hit (I don't see Rat or Tron filling such a role).
I do wonder how much of the demand usage is from local/repeat guests who have already ridden RotR. If that's a big driver, then perhaps demand will die down somewhat once that group has had their "fill" and be less apt to visit DHS frequently to ride it?