I wonder if after this we are going to have a gnomebuntu with the upstream gnome on the side of ubuntu, similarly to how we currently have kubuntu.
For some reason I tend to think that gnomebuntu, differently from kubuntu would be at risk of some opposition from inside ubuntu.
As an aside it is a pity that the name gubuntu is already taken! Otherwise we could have ubuntu (u for ubiquity), kubuntu (kde), gubuntu (gnome).
BTW, I now wonder if the U in Ubuntu for "ubiquity" from the very start :-)
A couple of notes on those specific things that are causing the fork.
1) Global menu.
This breaks the focus follows mouse model, being thus a bad idea.
2) Search centric OS (rather than file and directory organized).
This breaks multiuser systems and systems with solid state drives. The search database tends to double the users' space allocation. This is OK if you are a single user on a system with a 500 GB disk, which is largely space redundant. However, it is an issue if you are on a 80 GB solid state disk where space is precious. Similarly it is an issue if you run a system with 50 users, each with 20 GB space. Your required allocation grows from 1 TB to 2 TB for no reason.
This also burdens users to hell when their system stops working because of low disk conditions caused by the search engine.
To make matters worse, neither tracker nor strigi have explicit options to say "stop indexing these folders and give me back the space used to index them".
Finally there are privacy issues, when systems are given to other users without creating new accounts. Mr. A lends its system to Mr B. Before doing so he moves away data on which he has signed NDAs or which is anyway private (e.g. bank details). Unfortunately, Mr B. finds bits of that data in the search database (e.g. a password).