What is going on now is the same thing that happened with things like Waterfall. Bloat, and the methodology being commandeered and bogged down by bureaucracy.
Waterfall and Agile aren't even that different, but new methodologies with none of that bloat come into the picture, gain traction, become bloated, and go away. Rinse repeat.
This will keep happening for as long as corporate "leaders" try to pad their resumes with "innovation" and ignore the major function for SDLC these methodologies are supposed to serve, in favor of using it to spy on and audit their teams.