Not everyone would get used to OSX. The software support from many of the big companies isn’t there for OSX. And who is to say they are “stabler” and more secure? You can argue about which one is more secure forever and no one would win. Thing is not that many people use OSX, but a lot of people use Windows. In which software could more bugs and security problems be found? Why would hackers and virus writers bother with attacking the OSX community if only a small percentage of people use OSX?