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Point being...?
counter for kamui: genjutsu. before obito can even make a move he would be stuck ^^
also obito did want shisuis eye, yet he never tried to take it away from konoha. obito and akatsuki wanted the biju, yet, while itachi was alive they didnt attack konoha.
in road to ninja right when itachi appeared obito left saying, that he would be able to hurt him even if it was a worl obito himself was controlling.... (road to ninja written by kishi= canon)
and after itachis death he said: now that itachi is dead nothing stays in my way, lets go to konoha.....
we still dont know how obito survived the amaterasu he got hit with, but it was obvious that it had some kind of effect on him. in a real battle itachi would have more then enough time to defeat obto...
That's all well and good, but Obito's Kamui is fast enough to enter a Jinton cube, materialize, grab a person, then Kamui out of the Jinton , all before it exploded. Nothing Itachi has can hit Obito, and if it does, Izanagi.
Regarding Itachi, Obito and Konoha, Itachi was a member of Akatsuki. A useful one. If he attacked Konoha, Obito would have lost a valuable pawn.
Regarding the movie, haven't seen it, don't care.
Regarding Genjutsu, please.