The leaks are really a part of marketing...Apple doesn't need to crack down on anything because the meat of their iPhone's remains untold until their keynotes, and this is the same scenario EVERY year. Do you get an idea of what is coming? Sure...and that just helps Apple get their consumer base prepared and hyped up. People scurry all over the internet, searching for the latest leaked picture or spec list or whatever they find, and this just adds to the tidal wave of attention that is put on Apple every year before a big release.
So no, I do not agree...as it's such a trivial thing. If you don't want to see the leaked photos and information, don't go read the blogs and articles that contain such. This would be like telling movie studios that they need to crack down on movie trailers...it aint going to happen, and if you don't want to feel like it's being spoiled, don't watch the trailers.
It's really just simple self control...I personally realize that what IS leaked is usually about a speck of what is actually to come, so I don't mind reading into all of it, and laughing at most of it.