Exactly... AudioUnits and VST plugins literally must be loaded in-process of the host to be useful at all. As long as vendors aren't forced to use the App store for distribution I don't think anyone in that scene will care much about Apple's changes. In the digital music / VST / DAW scene I think the app store's initial launch amounted to a single "oh well, guess not" blog post on CDM and then everyone moved on. (I'm exaggerating a bit of course).