It's certainly hard to disagree with the view that in fact people often make a mess of things! No doubt even if the Epicurean wave had continued to build after Cicero's time (and maybe in fact it did) lots of people would have found a way water it down for their own lesser goals. But I think we ought to also appreciate the approach of Diogenes of Oinoanda in erecting his wall and speaking publicly in favor of a future time when more people saw that Epicurean philosophy can help them reconcile their apparently-conflicting interests.
I analogize this in my own mind to the function of the Epicurean gods and the respect to be paid to people who are truly wise. The Epicurean gods couldn't care less about us, and the same goes for Epicurus and the other Epicureans we read who are now long dead and can't receive our appreciation.
But visualize the life of a blessed being helps us to work toward that ourselves, and thinking about what Epicurus would do or say if he were watching us also helps to improve our actions. And likewise I'd submit that visualizing a world in which the name of Epicurus doesn't evoke blank stares, but comes to be seen as a central part of Western traditions that everyone knows about, also helps us think about how we can move in the right direction in our own lives and with our own circles of friends.