How does that means Jobs is right? If anything, it seems a significant percentage of current tablet users are not satisfied with their tablets(80% of which are iPads?) and want something with a bit more power.
Maybe they would have been happier with an iPad that was more powerful like the Windows 8 dev preview tablet? We will know when those come out.
Windows tablets have been available in a variety of forms for around twenty years. Without exception, they've all been failures in the marketplace.
People like the idea of a Windows tablet much more than the reality. Real products have to make compromises, like sacrificing performance or battery life to run legacy applications designed for PCs, and there's no magical way to make interfaces designed for a mouse and keyboard suitable for touch input without changing them completely.
I'm forced to use a windows xp tablet at work. Made by Philips. It's so bad it hurts, and every so often you see the cursor appear that is under your finger when you hit a button. It's buggy and hideous. Used once it could put you off Microsoft for life.
Maybe they would have been happier with an iPad that was more powerful like the Windows 8 dev preview tablet? We will know when those come out.