it's still [complete] imo and the added extras are just that, extras. agree with you there, it's nice for the public, the added stuff post-final etc, but it doesn't reopen the story to continue.
Also, Marty wants to
a. Show that's MITY is active
b. Keep himself busy
-while we all wait and see if cbob manage to quell his inner demons and get back to writing.
Judging by the last 2 years, eventually Marty will have to decide if to start a new game of his own (no, not 18titans, it seems that it's not "enough of a new project" even for Marty) under the MITY "brand", or to start/join a new venture.
Yes, I'm highly pessimistic abut CBob.