As nice as the Freestyle machines are; they absolutely wouldn't work at Disney with the sheer volume of people using them.
Most of the time they aren't very responsive, that slows down the process.
So many choices that slows down the process.
It might work somewhere like the Chase Lounge in Epcot where there is a limited number of people there, but if you put say 4-5 of these things inside the food court at any of the value resorts it would take forever.
Between the little kids who would want to try every flavor combo, and the seniors who aren't technology adept and easily confused it would be a nightmare.