I think people won't "ignore" the mask rule as much as .. lose it, drop it, get it wet, take it off because they are about to pass out, take it off because they are drinking and eating and forget to put it back on, let it drop off their nose and just not put it back on, etc.
With a limited capacity, mask and social distancing will be easy to enforce .. start to increase capacity and it will be near impossible.
Restricted or not, masks or not, there will be a lot of people, from all over, in one place and the virus could spread. There is no stopping it really. Just know people aren't going to follow the rules, and take that risk assessment yourself on whether to go to WDW or not. Then do what you can for YOURSELF to feel and be safe there and let's not worry what everyone else will do or not do.