Let's face it, there's probably not a single person in America who is pleased about the ball color change, but it's a small issue, not a big one. Yes, it was a mistake. After all, the four has been purple for a century. At this point, however, there aren't many who are complaining, and any suggestion that Matchroom is being defiant despite a significant outcry for reversion to the old colors in misinformed.
It's time to move on.
I disagree that it is time to move on from this if we really want the colors changed back. By your own estimation nearly all Americans would prefer a return to the old colors, and I hold that keeping up an outcry is necessary if this is going to take place. In the history of the world in general and specifically in western democracy nearly every change, for good or for bad, has begun with and was sustained by a vocal minority that would not stop promoting their position.
Populations, be they of a nation or a community centered around a common interest, tend to be apathetic and somewhat pessimistic on average. The majority will accept pretty much any condition that is set over them whether they like it or not as long as the condition in question doesn't hurt too much. For most, changing it seems like a lot of work, and some worry that the efforts for change may actually make things worse. They rationalize their acquiescence by saying, "It's just a small thing, and overall things are okay. Why rock the boat?"
However, introduce a vocal and determined minority into the situation and you will see support for that minority's position grow within the general population, with the desired change being the eventual outcome. There are various reasons for this which would take too long to describe here, but the point is that it consistently does happen. The process can be fast or slow, but if started and sustained by that vocal minority it will almost certainly have the desired effect. A few examples of this are our own American revolution, Christianity in general and the rise of Protestantism, or the relatively recent changes being made by the LGBTQ rights movement.
I'm not equating changing the 5-ball back to orange with any of these large social movements, but the nuts and bolts of instituting a change are the same.