I will caveat this by saying that I hate to generalize and that not all millennials are the same, some are hard working corporate shills just like their parents and some are feckless hippies just like their parents, and others are the opposite of whatever their parents were just because. Which makes them no less diverse than their predecessors. Anyway this is just my experience working with literally dozens of new college grads and interns over the last several years.
Now then: You are all missing the point. I personally note a "general trend" in millennials in my line of work to not work as much or as hard. It isn't because they are lazy, it seems to be a conscious trade between having free time and having money. So this whole question of money being equal to success is a red herring. They do not all see success the same as their predecessors. Many seem to be happy if they can make 80% of full salary and have every weekend be a 3 day weekend (and still avoid 10 hour days).