Eh, Apple is at about 3% marketshare now. They could triple that and still be considered marginal. Of course, for Apple to go to 10% would be fantastic. IMO, 10% would be great, big enough to have real weight in the industry(things like peripherals, software, website compatibility...), but still small enough to fly under a lot of radars. Then again, if Apple went to 10%, they would be one of the 5 biggest PC makers in the world. Remember, Dell is the biggest and they only have around 16% marketshare.
10% marketshare for Apple will still let the elitists feel better about themselves...