I think if you're between them, you're a "tweener". :) Since you're much closer to the millennials than I am, you seem to have a better feel for them. I'm a Boomer, but I'm right on the edge, so not so sure of my demographic.
I am with you on a move away from a two party system. I'm hopelessly non-partisan, so I just go with the policies, not the identities. I am hopeful the millennials will see the folly of the two-party system and replace it with something much better.