According to yellowbois, there is no way people will switch to questing. But only when the alternative is adding RDF. So this whole ‘plan’ is not to stop Boosting, but rather to make the Blizzard Paid Boost more cost and time effective than the RMT Boosting.
Either way, the player is going to want to (and have an avenue to) pay. They’re never going to level the normal way.