While 55+ is strongly pro-Israel, 35 to 54-year olds are moderately pro-Israel [1]. So sure, in 30 to 60 years we might see a demography-driven shift. (Gen Z isn't pro-Palestine as much as more evenly divided.)
One of the strategic mistake the American pro-Palestinian movement made from the beginning was deploying majoritarian tactics. Those don't work if you don't actually have a majority. (This protest is an example of it.) Instead, the movement should be deploying minority tactics in the way e.g. the gun lobby does.
[1] https://news.gallup.com/poll/611375/americans-views-israel-p...