I know I'm a little late to the party, but I wanted to throw in my two cents anyway. There's a lot of arguing going on here about how many FP-'s people were able to get on a given day, but has anyone considered how the number of party members? When I went with my family when I was a kid (early 2000's), we used FP, but we couldn't do much throughout the day because we moved so slowly. We maybe hit 7-8 rides (that's being generous) and probably used 3 FPs or less.
On the opposite end, I've gone with my BF a few times in the past few years, and we went during EXTREMELY low crowds. We went during Labor day week last year and MK was almost empty. We rode BTMRR four times that day, twice with FPs and twice we just walked right on. We got maybe 12-15 FPs in all, in MK, no less. We were even able to ge two FPs for Toy Story in one day in DHS later that week. My sister and her BF had the same experience FP-wise (not quite as many stand-by rides), and they even went in July.
I think a lot of the people sampled for the survey people keep mentioning were probably parents with multiple kids, so I can see why the average number of FPs was only two. It was so easy for my BF and I and my sister and her BF to tour last year not only because of how empty it was (at least for me, not for my sister since it was summertime), but because we were each a young couple with no kids or seniors. By the way, I'll also add that none ofus knew about FP "cheating" (not going during the appointed time) so we weren't doing that when we had all those FPs on our trips- not that we would have done that anyway. I think that's kind of rotten.
As for the current system, we were able to test it out when we were there in November. I had mixed feelings on it. I don't like being able to only book one "headliner," so I'm hoping that aspect goes away. As for the number of FP+s, I'd be fine with four or five if the crowds are low enough and the weather is okay. The idea that on-site guests might be able to have a few extra sounds great, because we usually stay on-site anyway. Really, as long as they keep the three standard issue that they have now, we can just go during a low crowd time, because we have the luxury to do so. I understand that some families don't have that luxury though.