Daring Fireball: Small, Cheap, and Without a Display
He makes some good points. The thing to remember is that any increase of market share, especially if it gets to double digits (remember 10 has 2 numbers), is good for the Home Computing Appliance Enthusiast.
While there are over 10,000 software titles for the Mac platform, there's a lot that you can't find at Wal-Mart. And that is important... Also this means more peripherals for the Mac as a Home Theater, or gaming platform!