I don't think most of the people who disliked FP+ prefer Genie+. I get the feeling from reading through these threads that they wanted either an all-standby system, MaxPass as it exists at DL, or an unlimited express pass like the kind you can get at Universal if you pay a significant sum or stay at one of their deluxe resorts. The problem is that WDW was never going to institute one of these as a replacement for FP+. So Disney did what a lot of people here predicted - instituted an inferior, paid system.
As far as children, there really isn't a time you won't see thousands of them at WDW; people will take their kids out of school for visits. With regard to masks, I believe only 6 of the 50 states mandate them and Florida isn't one of them. WDW is going above and beyond by requiring masks indoors, but if people aren't wearing them where they live, they get used to doing without them and don't seem particularly uncomfortable about it.