I remember hearing people say something like this: "The mouse and GUI are useless. The keyboard is much faster. And anyway, I'm a command line expert."
Sure, geeks like you and me are experts with legacy technology. We take the time to learn all the details. We like being experts, and change means we'll need to learn things all over again. But the general public aren't experts, they don't care that they aren't, and they don't care that you are. Get over it.
Like it or not, Lion is just another baby step toward Apple's future. 10 years from now Lion will look as primitive and clumsy as Mac OS X 10.0 "Cheetah" did back in 2001. We'll all wonder why Apple took so long to unify iOS and Mac OS, and we'll all agree that the single-OS-on-all-devices was the right way to go.
The next major release will probably not have a "big cat series" name. The name "Lion" has the ring of finality to it. King of the jungle. Done with cats. I expect the next major Mac OS release, maybe as early as 2013, to be heavily, if not completely, infused with iOS look, feel, and functionality. There will be just one App Store for all Apple devices, from iPod touch to 27" iMac. (And Macs will be running 4- and 8-core ARM CPUs, but that's another post.)