At this point, they have to realize that advanced bookings of Fastpasses are generally stress inducing not stress relieving. The fact that they have an alternative system for these two attractions tells me that there's at least a chance that there is a different plan, other than rolling new rides into the existing system.
Well... they dropped BGs with the initial opening of SWL and MFSR as soon as they no longer needed it. So, I don't think they're too wedded to the BG/VQ system.
I believe their thinking is such: By having a VQ with two types of BGs, namely, the main group and a back-up group, they can minimize having to give out park hoppers and return-fast-passes if the ride breaks down. They do this by having a main group that is very likely to ride, even with break-downs. And if there are indeed break-downs, well, then, at least they got that first group through and no compensatory freebies need to be given out.
And then, if there are no break-downs, then the back-up group can ride.
Thus, I foresee them having VQs until ride stability is very high.
Also, it would make sense that when MMRR opens, to put that on VQ and then put RotR in the top tier FP.
But, that's just my guess work.