Looking back at the last few months, around 50% of SLR Originals content has been PT. I would assume that some of the growth in PT viewing could be attributed to that high proportion of PT scenes (more PT content = more PT watch time). If that's true then it would suggest that a decrease in the proportion of PT scenes should lead to a decrease in PT growth.
I think it would be interesting to see what happens to PT growth once the backlog of Simsense PT scenes are exhausted. If it continues growing then it really is as popular as it appears to be.