I will speculate below but it is a moot point — what I do know is that those who survive as a business will be those who can read the signs correctly and adapt, but self publishers, alone, will definitely not inherit the earth (at least not in the
way most self publishers think).
Yet most self publishers will tell you that your BEST sales will NOT come from selling to bookstores (since they take 80 % or more of the profit!)
Most self publishers aren't.
Most self publishers are not up front with their business model.
Most self publishers will allow you to sell books on their site.
Most self publishers, most authors, don't make money.