I don't really think so. CUT is not going to be radically different than the current testing.
Debian Stable rapidly becomes woefully obsolete - it's usually about 3-4 years old. New hardware is not supported, new versions of infrastructure software (Python, Ruby, Java, etc.) are not supported and so on.
It's nice to run it on servers, but I'm not able to use it even on locked-down business desktops!
My favorite idea is splitting Debian into "Debian Core" and "Debian Universe". "Debian Core" will have fairly rapid release cycle (yearly, perhaps) and will include only core infrastructure software (kernel, X, Python, gcc). And "Debian Universe" will contain everything else.
Kinda like Ubuntu's model of Multiverse or Arch's AURs.