Nana killing with uthrow would create a greater multitude of situations in which the ICs can get a free kill, actually. It would also seem sort of sloppy, I think, when there are so many "cleaner" solutions, albeit much more complicated ones.
I fully support the concept of having a way to initiate a grab break if you are regrabbed within a very short time period of being thrown (basically only long enough to affect the IC alt throws). It would be a very specific input, like giza said, so you wouldn't be able to try to DI while doing it, meaning if you think your opponent will alt throw but instead they go for another chainthrow, then you can't get out of the alternative chainthrow. By the same token, if you expect the alternative chainthrow and try to DI, you won't get the grab escape. The grab escape should give the ICs frame advantage, but not give them a free regrab. It keeps the alt throws as part of the IC's game, but instead of an infinite, it creates a mixup situation.
Also, I knew this poll should've specifically stated in the poll options and the first post that it was only talking about the infinite - the alt throws. So many people in this thread under the impression that we want to completely remove chain throws from the ICs's game... which just isn't true.
And I've really gotta wonder why there's a "wait" option when the very people arguing for this change are not arguing it based on a balance perspective, but on the fundamental game design. Waiting doesn't really have any bearing on the argument...