Exactly. You talked about Madara vs Itachi not Itachi vs Juubi, and definitely didn't say Itachi is invincible.Maybe I did in a way, I didn't clarify that Itachi would have to actually hit Madara which is important too as Madara is very fast and could probably just warp himself/Itachi elsewhere.
Anyway. Yes Madara is fast, but Itachi was not slow either. There will always be some counters to every capability. Example, as of now Kishi has told us 5 counters to 9 tails, SO6P's way, Mokuton, Sharingan, Special Chakras, and Sealing.
Madara can't win in a battle if he doesn't strike, but if he strikes he risks of being hit. Minato showed us that it's possible to make Madara solid by putting a seal on Madara. So far that was the only way Kishi showed us to beat Madara. At least there are 2 other ways that Kishi has not shown us, the 1st Hokage's way and the Kirigakure's way. Let's take Minato's way a step further. It will need someone very adept at creating barriers and seals to do it, you must put the barriers and seals that make Madara solid within the battleground. The rest will depend on the capabilities of the combatants.
As far as we know so far, there were no damages being inflicted by Madara's warp. It simply sends the object to another place. The counter to this I think is simple if you have a contract or if you has space/time jutsu. If you have a contract then you can simply reverse summon yourself. But of course it's much better if you don't get caught by it in the 1st place.
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