It’s definitely not now or never. And thank God for that, because the “youth,” let’s say voters age 18-30, make up less than 20% of the vote. Even if we assume that all voters in that range and 10% of remaining Democrats vote for this hypothetical third party, and assume that the 18% of voters that are non-leaning independents according to polls will vote for that candidate, we get the Democrats and this third party tied at 34.4, with the Republicans trailing at 31.2 (assuming, of course, no other third parties, just for the sake of the hypothetical). And of course, that’s including independents who vote along party lines but don’t admit it on polls as well as people who vote for the Libertarian Party, the Constitution Party, the American Nazi Party, and the Green Party all in the same group as though they’re all going to unite behind this person. It also assumes that the popular vote is the deciding factor in an election, which it isn’t.
If we really want to see third parties win outside of flukes like what almost happened in 1992, we need to change the election system itself, because otherwise, we eventually get a party in place as replacing one of the current major parties and they settle into an equilibrium of being more or less what these ones are based on the political landscape of this country as it generally functions and progresses.