There has to be a way to break out of Izanami.
Otherwise Naruto and Co. are as good as dead against Tobi.
Danzous Izanagi/Sharingan-arm was an incomplete one? Just like Orochimaru who always had access to Sharingans, but never transplanted them, because he wanted to use the full potential of the Sharingan. So his goal was to take over an Uchiha body. Tobi could be thinking the same way.
So that's what Izanami does? I'm kinda disappointed. Maybe only because I don't fully understand the potential use of this power but we'll have to wait for next chapter to shed some light on this matter. I felt like Itachi just used Tsukuyomi on Kabuto because that's can easily be a genjutsu ability. Maybe it appear that way but IDK. As of right now I think Izanagi seem more powerful but we know it's risk as to Izanami, we don't know the side effect yet.
I don't know if anyone has said this before but: Hello, my name is Itachi and welcome to the Infinite Loop. At the end you get a free pat in the head.
A lot of you guys are forgetting that the sharingan arm required the cells of the first hokage. Tobi would have to prepare that as well.
I don't know of Tobi had that much time to prepare that many eyes and implant the first hokages cells, make those other bodies and implant the rinnegan.