Neat idea, impossible execution
It's actually an idea that makes a lot of sense on the surface, and variations on the dualbooting idea have been at work for a while (
Lenovo's Hybrid,
Fujitu's dualbooting smartphone)
This idea always seems to intrigue people who think it's the best of both, but the final result cannot help but be disappointing because inevitably you get the worst of both worlds.
Let's consider why. This is basically a rehash of Windows Tablet PC idea, but with the dual boot option thrown in. (and yes, I am a forced Windows Tablet PC user, thank you for asking)
- Exterior design: There'll have to be some extra hinge or other swivel mechanism, or at least some sort of docking thing. This means the tablet will be thicker, heavier, more complicated, less visually pleasing, more fragile and more expensive to produce.
- Innards: Basically it'll have to be a Macbook Air with the iPad circuit thrown in with extra sophistication. The final result will have to be larger and heavier than Macbook Air, significantly, and will be much more expensive.
So we now have a Macbook Air,except it's more expensive, not anymore powerful, and heavier. Also we have a tablet that's heavier and larger, more expensive and not anymore powerful than iPad. It's absolutely the worst of both worlds.
Apple will try to combine iOS and OSX at some point, but for now, the OSX tablet is a terrible idea. iPad has taken off precisely because Apple realized they had to ditch the desktop legacy, whereas Microsoft had been trying hard to bring the legacy into the tablet for the 10 years and failed.