if you consider GNOME 2 and GNOME 3 to be different projects. They are not.From the developer's point of view, maybe not. But from the user's point of view it does appear that GNOME 2 was abandoned and replaced by a new project GNOME 3 which is quite different. So, to adapt what you wrote: do you really want to base the distribution on a desktop environment which will probably be abandoned and replaced with something different a few years from now? (even if technically, the new thing is written by the same people and has a similar name)
(I would say the answer is probably yes, since Fedora is not RHEL and it is more important to have the latest stuff rather than commit to provide a stable environment for the next N years.)
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