I think it's hard for anyone to say anything authoritative about the subject as it relies on history that hasn't been written yet. I think we can say that the Baby Boomers were a demographic anomaly and that any opinions formed and reinforced through mass media are going to have a tough time maintaining market share against opinions and ideas that self-generate organically. The modern Republican party is an anomaly. Once the generation that has been indoctrinated into an ideology that runs contrary to their interests have died out, there will be no one to replace them. It isn't so much about what people believe, it's about what they've been convinced to believe.
You're right about the anomaly part, and I really hope what you say holds true in the future. Nevertheless, we won't have a perfect world, but hopefully things will get better.