I think that has relevance to us in looking at our elections and voter turnout.
No matter how much opinion polls may show younger people being less conservative, and less likely to vote for Trump, we must not think that is wholly descriptive of what will happen in coming years.
Right after Trump was elected I posted a link to a historian who discussed that the whole arc of history narrative is just that - a narrative, not an inevitability.
Likewise, I propose, we must be careful to not fall into a myth of demography.