There is jump going from "I see this happening" to "this is what user's want." For example, the trend is also towards massive tracking, more ads, and heavier and heavier pages. Users don't want these things, but business forces create them.

I think this is probably true of many (not all) of the kinds of things you are calling "interactivity". In any case, the reasoning isn't sound, even if you think your conclusion is.