I'm married to a CPA and after I read off the 3 FP+ per park/day, he said we will be charged to get more and that sounds like an absolute minimum so each guest is covered.. of course there will be surveys and comments prior to it rolling out as a paid option, but he said it's a goldmine and Disney wants money for it, kinda like UO charging extra for their express pass.
I know you all are probably thinking that is ludicrous and wouldn't happen, but I liken it to the Early Bird Checkin option that Southwest airlines started a few years ago.. at first, a lot were up in arms about it, but now I see many people paying that extra money to utilize that option. And that is what extra FP+s would be, an add-on option.
Just wanted to offer the unpopular, alternative, Disney greedy way of thinking... not trying to offend anyone. After all, it's all about maximizing profit by getting guests on property, staying there and spending all their money in Disney.