Well not quite - programmers, pro video editing and a few other tasks will need a mac. Everyone else will want the tablet. They will replace the iMacs and Macbooks. (not overnight). Us programmers, enthusiasts, and graphic pros will still need a Mac to deal with large files, etc. Support costs and the ability to run unsigned software kind of doom the open natured Mac and PC. Don't forget about the hassle to backup, install apps, uninstall apps, etc. People just don't want that. Apple can sell an iPod touch for $200 only because support costs are so much lower than a macbook. When you buy a new tablet to replace a lost or old one, you just log in and everything will appear, just as you left it. I see no reason why there won't be 5" and 70" versions of this (not right away). It could have a USB port with only 'Made for the apple tablet' peripherals plugging into it, like keyboards, printers, etc. PCs and Macs are just way too much for the average person's computer needs. They want email, web, tv, movies, books, photos and personal video. They don't want backup, restore, hard drive crash woes, unsigned applications and wonky extensions.