Here's some food for thought for you guys

[True Power Incarnate 2012]

Why hasn't kakashi thought of sending madara to another dimension, the reason i say this is cause madara wouldn't be able to get out since he can't use kamui like obito and kakashi plus with him gone naruto and co can gang up on the jubi and obito without madara uchiha interferring, oh damn it i just remembered! say if kakashi did send madara to another dimension that would be silly since obito could easily go to the dimension and get madara out but then again since obito wasn't pleased to see madara i guess if kakashi sent madara away obito wouldn't give a ****.

[★LssJBroly]

It really depends whether Madara can escape by summoning something in there :shrug:

But I guess Madara would counter Kakashi if he did that. But a lot of fans theorize that that will be how Madara is defeated. He will be put in the dimension by Obito who turns good.

[soyeongun]

Yeah good point. Waiting to see Obito turns his back on Madara.

[dirklyn]

He knows madara already has to counter to kamui

[Kokuo]

He most likely has a counter to it he is Madara after all, and even if he didn't, Obito could bring him out.