Played with MS Surface and Lenovo Yoga today at Best Buy
Laptops and tablets represent two different ways of interacting with a computer. Most work gets done using the laptop but touch offers some conveniences for consuming content. The tablet by itself far more limiting than a laptop by itself while the hybrid device delivers the best of both. Provided the hybrid is priced correctly for the extra flexibility it is easy to understand why consumers would buy these over simple tablets. Also, all W8 hybrid laptops offer full x86 compatibility when using the tablet which delivers far greater power and versatility than ARM based devices.
Going forward there will be so many models of hybrids that it will become the default form factor for laptops.