Neoplatonism and Epicureanism

Neoplatonism in all its variety ruled the roost in late antiquity. But i still haven't really explained why it succeeded at the expense of the other schools. There is a good deal of stoic cosmology and ethics woven into the fabric of neoplatonism. Neoplatonists find them useful only as opponents to be defeated. And often seem to think that epicureanism in particular, is barely worth refuting.