They did.
Guest satisfaction goes down when the park is overcrowded.
Disney has done a lot of things to reduce overcrowding:
- MDE and FP+ (helped and hurt at the same time)
- Big increases in pricing but with discounts in the off peak (to make people move to off peak)
- Selling the park twice (holiday nights, early/late hours)
- bringing their two underutilized half-day parks to full day (DAK & DHS)
- Surge pricing (costs more for certain times of the year, costs more for an 'anytime' ticket)
So, WDW has done a lot to deal with the overcrowding (and by that, we mean at MK which is getting twice the number of people it was built for). The last thing that they could do (as you point out) is the nuclear option: Cap attendance to be lower. But that means turning people away at the gate who have APs or anytime tickets in favor of those who bought the time-limited tickets. It also means limiting the amount of time-limited tickets and making people declare what day they'll be at the MK (which is what they'll be doing on this re-start-up). And so, part of that nuclear option is dealing with people who are only free for vacation on one specific week of the year, but all the tickets for the MK are sold out for that week.
Other then enacting the nuclear option, look for prices to continue to climb and for the beefing up of the three under-utilized parks.