Huge and obvious tactical and strategic error
Nothing wrong with Shuttlesworth getting the idea of some new interface which will be the cats pajama's.
HUGE MISTAKE to alienate most/many of his most valuable asset- his previously happy users and advocates- by removing the interface they would need to get the system to do what they wanted without needless additional trouble. He is forcing his users onto a system which has more than its share of bugs, problems.
All Shuttleworth had to do was make Ubuntu continue to run with a gnome shell as an option. If his new pet interface was so great, then users would change over to it on their own.
I really curious how or if Ubuntu recovers from this. Let me offer a simple suggestion- See above.