I think many of these problems could be minimized, mitigated or some completely eliminated if millennials would actually vote. But they don't. And I don't foresee that ever changing. It was the same problem with my generation, gen-x (born in 1980 so I'm not quite a gen-x, not quite a millennial). We just didn't vote. I don't believe the <30 crowd has ever been a big voting bloc, at any point in U.S history.
Though, I noticed many of my facebook friends started voting once they hit their early 30s. I think that's when people start to settle down in life and either have the time to study/figure out politics, or get more interested in it. It might be the time where their youthful naive idealism vanishes and they realize that true change is a slow process. They become more pragmatic and more realistic. Much of their concerns tend to be more local/regional where their votes actually hold some power. It's less about voting in a president who can wave a magic wand and create their ideal utopia overnight and more about voting in a local city councilman or state senator who will best represent their interests. People they have actually met in real life and shook their hands.