one of the important words there is “younger.” as people get older, most of them drift to the right politically.
there is a demographic “bulge” – the babyboomers, who are getting older (and voting more regularly). their age is pulling them rightward, and there are a lot of them. the millennials are flirting with the left, but there are not so many of them (the birth control pill became common late ’60s and following).
how will all this work out? near term – looks like slow rightward drift. intermediate? long term? we have to wait and see. some of us won’t last that long – i’m 74.