Were you expecting it to walk the dog for you or something?
I don't think there is much more you can evolve with a computer. The current computers do pretty much what we ask of them and if everything is working most people only upgrade because they want faster performance or a software requires a higher minimum specifications.
In a way it's like cars. They really haven't changed all that much from when I grew up. The car I had 20 years ago isn't that much different from now. There are a lot refinements a few new additions but the basic overall technology is pretty much the same. The only reason why there is newer tech such as hybrids and electric cars is because there is a growing need for alternative fuel cars.
This is the same with computers. Most of us use our computers the same way we did several years ago so unless you really want your computer to walk your dog then there really isn't much to innovate. The iPhone is in a different category because smart phones are still relatively new so there are still things to innovate and improve upon. You can't compare apples to oranges if you are familiar with that expression. Apple can definitely evolve computers by making them transform into robots but that's not when we want computers for. It's the same with lots of other electronics. Just look at printers. What more do you want them to do but print faster, larger, and with finer details? Not much innovation that can be done.
I also have a PowerBook too and my MacBook Pro is quieter, has a more solid unibody built, the LED screen is much brighter and nicer to look at and won't fade over time like older LCD technology. The trackpad gestures alone was worth it for me since I can pretty much do every commonly used shortcut I use daily all on the trackpad without reaching for the keyboard or mouse. The glass trackpad is also smoother to use than my PowerBook's metal trackpad. The battery life per charge is 3 times as long as my old PowerBook. I thought those were great changes but I still mainly upgrade my computer because I need the faster performance rather than some revolutionary change in computer technology.
Although if all you care about was innovation and change then you might want to look at an iPad. Is that different enough for you? For some people that's their laptop replacement so I guess Apple did innovate and created a new type of "laptop". Some people believe that's the evolution of the laptop for some people. You just bought the wrong device.