I think it'd be neat if Y Windows took off as a successor to X-Windows. Presuming, of course, that Y Windows is as good a project as it seems to be. Regardless, I understand that X-Windows is showing its age and could stand to be replaced.
As an aside, that's what's kind of neat about the unix philosophy. Every part of the system besides the kernel isn't "part of" the system... you can't separate Explorer from Windows, but in unix-land you have all these discrete parts that interoperate. If something better comes along, you can go ahead and use it.
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