I was responding to @scott_w saying that process change not taking root isn't the consultant's fault, because companies don't want to pay for good process change. I disagree: I think it's the consultants job to be clear about what's needed to succeed, and not work for companies that don't want to pay for good work.
Regarding methodologies, I agree that successful teams internalize the principles behind their methods and leave the by-the-book methodologies behind. I think you're being overly cynical, though. Beginners need a concrete place to start. It's like saying cookbooks are a sham because expert chefs don't need them.