Magicians have been having this debate about exposure for ages. Unfortunately, nothing has happened as a result of all these debates. This is due to the nature of exposure itself. There really is very little one can do when you realize that magic is mostly about ideas (quite often simple ideas).
If someone is making copies of instructional videos or books or notes and giving them away for free, you could take legal action because of copyright violation. If you had some gimmick patented and someone was reproducing it and selling it without giving you royalties, you could sue in court.
On the other hand, if someone explains that magicians sometimes display two cards as one in the context of some trick, that is just telling the world an idea that anyone could have come up with. We can't do anything (at least under current law in most countries) to stop an idea from being broadcast. So there really is no point worrying about that.
It is also true that most laymen don't go searching out for secrets. I had a couple of spectators who told me they would later go and search for the secret. Guess what? They had other things to do and forgot to search for the trick's secret.
Now if we are talking about amateur magicians and dabblers who search for free tutorials instead of buying the books/dvds/tricks from the source, that is a different problem. They will never be as good as those who practice the proper technique and methods by going to the original source. Unfortunately, the internet has increased the number of dabblers because of the ease of access to information. I feel this just something all the serious magicians have to live with, as I don't see any solutions.
At any rate, one thing you can do is to make sure you don't compromise on the quality of your magic. That way you will stand out when someone compares you to the army of dilettantes out there.