Just to clarify, in light of the recent discussions, I'm not saying anything about "natural limits."
I'm saying the idea that hypertrophy occurs at a glacial pace is retarded nonsense invented by scumbag "naturals" whose lives depend on their false image.
"Plateaus" in general are nonsense too. If you are "stuck" you just need to find the "solution" to your "problem" and then things will move smoothly again. There is nothing at all NECESSARY about a plateau, give me a fucking break... just because everyone is bound to run into problems doesn't mean that plateaus are some sort of condition of life... it means you didn't know how to get bigger.
If you knew how to train, eat, rest, program, and most importantly when to take your steroids, from the get-go, you would shoot up to your "genetic potential" in no time.
If any successful bodybuilder could rewind the clock and do things all over again, they would probably forget the meaning of the word "plateau" (unless they remembered to attend geography this time...).
If you are stuck bouncing around weight for years and still unhappy with your body... put down the cell-tech and pick up the syringe.