Hi, bonjour,
I am the network manager in "Collège de Sherbrooke", Québec (about 6000 students). I also develop internal apps in PHP, and I introduced PHP to some teachers here. We all use phpmyadmin, of course :)
The tree split is ok for me. About being 8 developpers: I think if it becomes a problem for cvs sync, there could be less people committing changes, and more e-mailing of discussion and patches.
About the future of phpmyadmin: - keep up with MySQL evolution - stay user-friendly - maybe database folders (to keep the left frame clean :) - maybe integrate an application/form generator...