Have you considered that maybe they're moving WRs all over now because they have the personnel to do that and they didn't before? Maybe they were limited previously because Dez was limited? I'm not saying he was or wasn't because I don't know, but it is a reasonable question that an objective person would ask. Maybe it wasn't an issue previously because of Romo's skillset. Human nature being what it is, it's tough for a person to accept a change or something new if what's being done is working. Same with the coaches. Basically, if it ain't broke, don't fix it as the saying goes.
The problem comes when it's no longer working. But by that time, actually implementing change might be a little like trying to turn the Titanic, it can be done, just not quickly. At that point, maybe the quickest way to get to where you're going is to simply change what you're working with It's not "scapegoating", it's just what is the best course. Kind of like the famous quote from Big Jake - your fault, my fault, nobodies fault, it's time to change something.