The topic has been much debated. I know where you are coming from though - having read the AAIB reports for the pass five years, I'd guess there are no more than five months when a C152 didn't have a nose wheel torn off.
On the one hand, the accidents are often (but not always) training accidents, and you would expect more mistakes to be made in training. In the early stages of training an instructor might hold their hand firmly in front of their yoke, to stop their student lowering the nose too much, but at some point the instructor has to let the student do the entire landing, including making corrections themselves, without seeing an expectant hand hovering by. Same goes for the error of not rounding out quickly enough. Perhaps its just a price we have to pay for having trainers that you can't groundloop (easily

).
On the other hand, the frequency suggests that something is amiss with the training regime - it also suggests that the problem is not a recent one, nor is the frequency changing very much.
I've not studied the location of the accident reports in detail, from my own training I found (in the early stages) that the 350m runway was not quite long enough to give plenty of time to float the aircraft along the runway until it begun to run out of flying speed (just in case you'd come in too fast - a very common problem, and one that is probably linked with the nose wheel collapse problem). The approach speed control is I think the key to this problem:
You come in too fast, so you have less time to make the transition to level flight, which means less margin for error. Too much speed means the end of the runway is rushing up at you, so you either push it on at high speed (poor nose wheel) or go around and risk your instructor's wrath, plus spend an additional 10 minutes in the pattern to do it again.
What do others think?