I don’t think Disney has capacity to allow for no strings attached unlimited FP for a large number of guests, especially in conjunction with the regular system still existing for another large number of guests. The FP lines at attractions like 7DMT, FoP, and SDD (in addition to the new headliners that aren’t open or don’t use FP yet) would be an absolute cluster, and the stand by lines? Yikes.
I also think for better or worse Disney has dug their heels in with planning in detail, and it doesn’t seem to fit with their desire to control crowds and staff the parks to allow people to just do whatever they want to do when they want to do it. Disney Genie seems to fit this, a whole new system to create itineraries and plans. It also would surprise me to see Disney removing offsite guests from the equation (without a huge additional expense for them), as I think those guests “committing” to Disney before arrival is huge.
I can see paid coming. I think we might end up with a system where free FP are slim pickins and limited to uber planners, and the good stuff is mostly pay to play. I can’t see a universal style system happening. If it does come, I think the price tag will be extremely high and there’s no way they give it to every deluxe guest. Maybe I’ll be eating my words, who knows.