Steve Jobbs made the right move in my eyes, with the change to intel. I am tad bias on this matter, however, considering I am windows based developer. In the coming years I am sure that we will see MAC clones all over the market, thus making the MAC os cheaper and readily accessable for the average joe. With this in mind we will see a rise in MAC usage from the average person.
Although, this was the right move, I seriously doubt that it will impact Microsoft the way Jobbs intended. With the up coming release of Longhorn, I believe that Microsoft will continue out do Apple.