I agree that Disney's overuse of VQs is a major part of the reason the parks feel so crowded all the time -- but I'm not entirely sure what they can do at this point. Of course going on a building spree and adding several new attractions at every park would help, but even if they were willing to do that on a mass scale in a short period (and seems pretty clear that they aren't) I'm not sure how feasible it is with their spiraling costs. That could easily require investing $10+ billion.
There are very few attractions on property I'd wait 60+ minutes in line to ride, and that's likely what would happen for most attractions at the non-MK parks if they switched to all standby now.
It's their own fault in that they let capacity lag and tried to fix it with VQs, but they've kind of put themselves into a box now. Either they invest gigantic sums of money to fix the capacity problem, or they cling to VQs so that guests don't spend their entire day waiting in line to get on a handful of attractions.
I suppose the third option is dramatically decreasing attendance with higher prices, attendance caps, etc., and while they have signaled that's their intent (at least to an extent), it's hard to believe they're willing to take the revenue hit necessary for that strategy to truly work (i.e. to actually decrease attendance enough to fix crowding/standby line wait times).