"We're not really ready for this change, and we haven't messaged it properly. After discussion with Allan Day and Jakup Steiner, we'll defer this change until the next cycle."
As others have commented, I've always found that having two copy paste processes cause a slight mental pause sometimes. I tend to use middle drag middle click paste in terminal applications and the drag to highlight, select edit/copy then click in desired position, select edit/paste for graphical applications.
Interesting to see how this pans out. Gnome has significant contributions from Red Hat staff. Red Hat have suggested they will be releasing the desktop RHEL7 with Gnome Classic as the default UI to minimise training costs for customers.[1]
[1] http://www.h-online.com/open/news/item/Red-Hat-confirms-GNOM...
Now I'm just looking forward to the update where this is quietly reinserted and things start acting weird.