As a prospective new user (hopefully soon), I'm a bit worried Apples intention to make the Mac more like the iPad.
If people want an iPad, they buy an iPad.
Those that buy an iMac, want a desktop.
That and the (theoretical) step forward in making Mac OS a bit more closed in terms of what you run on it worries me. I know Gatekeeper doesn't close down the machine, but it seems a step towards that.
Seems to me like they are working towards a similar UI between devices. Nothing wrong with that at all. Even though the UI may be similar, trust me the iPad is no iMac and the iMac is no iPad.
We have iPad's, iPod Touch's, iPhones, iMac's, Mac Pro, here so that similar UI has its benefits. I do not see it as limiting the functionality. It changes how some things get done, but not that they can get done.
I guess for some it may be an issue, just depends on your usage.
You could alway stick with 10.6.x, we did with one of our systems. We even have a 10.5.x system here as well.