Does it drag
in other KDE 4 dependencies?
Obviously it depends on kdelibs and kde-runtime like
any KDE application.
The
dependencies will of course be better once frameworks 5 are released.
Considering the impact on a running environment I would say that all
depends
whether your users are using any KDE 4 applications or none. I would be
surprised if your users would use no KDE 4 applications. So I think it is
negligible.
Right away AFAIK we would lose DCOP integration, the window styles that
come with TDE, and the kcontrol integration. Users can already run
different window managers (compiz anyone?) so I would say this decision
should be made on a per-user basis. A set of instructions on the Wiki for
configuring a users' session to use kwin4 wouldn't hurt. ;-)
Tim