Isn't it also possible that the opposite would happen? That is, people would oppose the new system because they fear change?

Perhaps both are true. I don't know if these stereotypes are actually supported by data, but it seems like we tend to expect young people to be both more idealistic/naive (depending on your perspective) and open to change. Similarly, the very terms 'progressive' and 'conservative' refer to the degree to which they advocate change.