Isn't this similar to the "if people didn't like price increases they wouldn't pay" argument? If everyone was complaining about crowds, wouldn't they have stopped going? And if they continued to go, just as they continued to pay, doesn't that negate their right to complain about it?
I am being more than a tad facetious, but the point holds. ALL issues raised by customers are valid discussions and should not be dismissed.
And along the issue of crowds, there are other ways to disperse crowds, namely through increased capacity. And in the past Disney did this by having plentiful A-C tickets. The D's and E's sold the tickets, and the ABC's keep the guests happy once they were there. But in recent years new lands have been opened without the supporting "lower" level attractions, at least not in the appropriate ratio. So the crowds flock to ride Rise of the Resistance and Flight of Passage, but there isn't enough being added to keep them occupied while they wait. So the pre-existing attractions and other guest areas become more crowded. So sure, as of today, raising prices is the fastest way to address this issue. But long term, having appropriate capacity is likely more effective and in this case Disney has dropped that ball by not reacting to those customer complaints for years.