Why Linux ( read open source)is not a challenge to MS?

I am a computer nerd... and I don't like Linux. Straight out. (I hear a gasp!) Personally, I don't like the idea of open-source software for business applications. You end up counting on a community of software developers for updates rather than an established business with a consumer base at stake. I like using Tomcat for my own personal sandbox, but I'll stick with the status quo when it comes to my customers and their enterprise. In all honesty, how much longer do we REALLY think 'open-source' will last? If the sun rose tomorrow and Linux were the majority, it would only be a matter of time before someone found a way to make it 'profitable'... Just my cynical view. :-)