The kdbuswreck

Quite possible. ;)

To be honest, I'd prefer if this was done with something more generic, i.e. multi-listener AF_UNIX-like and whatever new SCM_CRED stuff needed to support authentication, so that it could benefit now just DBus but also whichever IPC system ends up replacing DBus.

Attaching and exposing kernel capabilities to sockets by default in a new API definitely sounds scarey!