@BCS Well, many people still enjoy the kids shows they've watched when they were children.
Like, pokemon and stuff. I still watch the new Doraemon movies that come out. (And I'm someone who rarely even watches anime.)
Apparently, there has been a PreCure TV series every year since 2004.
No wonder it's the go-to series to parody/reference in manga (probably even more frequently than Sailor Moon).