CivicFan, no. The archicture of Windows is completely different than that of Mac since is Unix based. Not only is it the biggest target, but it's because of the architectural differences that it bears the most viruses by far. The old Mac OS 9 suffered the same fate as it had no built-in security since it did not follow the Unix-model for security. But in practice, most viruses weren't written to destroy the old Mac OS since the market didn't have that many of them.
Network worm/trojans can hit any O.S., but mainly Windows due to those very same architectural differences.
So, no, we won't. Seems like nothing has changed in one way: I used to get calls by end-users years ago claiming that their computer had a virus. When in reality, the Mac OS 9 machine simply passed the Word macro viruses on to any PC since those Word macro viruses had no effect on Mac boxes at the time. Sounds like the same thing now.