When will the rise of the 49ers’ next dynasty come, after three-decade wait?

SAN FRANCISCO – Imagine Brock Purdy showing up on a red carpet 40 years from now. Joining him are a cavalry of superstar sidekicks, some of whom might be in high school right now.

“Brock, Brock, how did you turn the 49ers’ franchise back into a Super Bowl winner?”

Future 49ers champions still won’t match the Team of the ’80s in terms of a storybook dynasty that carried into the ’90s.

That past glory, even after all these years, is impressively celebrated in a docuseries, “Rise...