I have never waited an hour with a FP+ and I have done FoP quite a few times, with FP+. At most I would say we spent 30 minutes from the time I entered until I got off. The only other ride I can think of that cause me to wait close to that may be TT, and then the safari due to the nature of the ride but I don't think it has R/S.
That said Disney is fully aware of their wait times in both lines and would have to be beyond stupid to not factor that in to their new system. We don't know for sure what this "one hour" means so I would like to wait and see how it is all set up rather than get all upset.
Going digital gives them many more parameters they can add to the old system. Just like the
DAS, change is hard, folks get upset, but the system is quite fair, runs smooth and handles the need.
WE ALL make decisions about when we go to Disney for our luxury vacation. If a young child is going to impact your touring plans then maybe wait. I've gone to Disney with my kids since they were 4 mos old and we make it work and have never had a bad trip because a child was too small to ride. It is not Disney's job to plan my trips to my likes.
I just don't understand why it's so hard to do something with your other child. Nothing about this sounds like that is going to happen. It sounds like maybe your pass isn't going to last for days/weeks but I don't believe this one hour thing will come into play as folks think because Disney knows many of these rides they are talking about have a wait time that long.
But even if I were expected to do back to back rides, I never had trouble doing something with a child, occupying them in a positive way ... and I still have to handle this situation.