Well, here's one way you can tell that the Mac is getting more popular: scam software that has been a plague for uneducated WIndows users for years is starting to pop up for the Mac. That's a sign of a larger market. From F-Secure:

So what does the first Mac rogue application really mean? It means that with Mac's growing popularity and growing user base comes certain problems that can't be ignored. Mac users will increasingly come under attack from bad guys and this new rogue application and the constant stream of new variants of DNSChanger is proof of that. It doesn't mean that Mac is becoming less secure in and of itself. But it does mean that Mac users will have to watch out for social engineering tricks just like Windows users have had to do for years.

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