Misconception : There is no counter to kamui. Truth: There are several counters.

[Conspirator.]

@Naestro
It's true. Shadow clones may work, but the kamui user may use kamui before the opponent even has time to make shadow clones. Izanami isn't a good tactic either for various reasons.

 

[ShinjuMadara]

Tsukuyomi requires eye contact, doesn't work if enemy is in Kamui dimension

I don't understand your logic with Izanami, Izanagi definitely is a counter but it causes blindness, so it's only under life death situations

FTG is inferior to Kamui in everyway

I don't understand your logic with Shadow clones, the Kamui user just lets all the clones pass through him....

Kamui is still way too hax, next to Kotoamatsukami, it is one of the greatest Jutsus of all time second only to Izanagi

 

[Tera Path]

Your first argument about Obito knowing, He did not know. Let me tell you why:
1. Because he did not know that FTG marks lasts forever (Unless you become 10 tails jinchuriki, or that object which he put mark on is destroyed).
2. He also did not know that Minato had a FTG v2 in which he can teleport to his kunai and attack his target. Therefore your argument on this is invalid and based on your own ASSUMPTION.

Your point on chakra cloak, you could be right. FTG still counters kamui, it has been demonstrated before successfully. Minato did not take 1 hit in that fight while delivering several large blows to Obito. The reasons are still not clear, i still firmly believe that the user can teleport in and out of kamui land if there is a mark. Let me go do some research on it and get back to you =]

You also mentioned "If this is truly the case, I could mention a ton of reasons too, more than these 4." I truely did not understand what you're saying here though. Just to be clear my statement was "3. I never stated one opinion where you STOP kamui, you don't stop kamui. Everything i presented here is a tactic/technique where you can HURT or KILL the kamui user." Could you clarify on your statement please.

I said that you presented tactics to hurt or kill a kamui user, and you presented 4 uses of these tactics/techniques.
I don't really remember everything I was trying to point out because I totally forgot about this post but I will try to go on.

I think what I tried to say was that there is no true counter for kamui to stop it or anything like that.
And if the case was just trying to hurt or kill a kamui user, I could mention a bunch of things other than what you had listed.

 

[AlphaScythian]

Highly improbable scenarios.
None of this will work on intangibility.

 

[End of Days]

1) genjutsu in general is easily avoided by avoiding eye contact
2) izanami requires physical contact which is next to impossible with kamui
3) shadow clones are a dumb idea as obito will simply destroy anyone he suspects to be a clone

Spoiler

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4) only hiraishin stage 2 is fast enough for obito and possibly stage 3