Yes. His wish will effectively undo all of EC which would mean he and his Hikaru never get separated, and that's so unbelievably important. His Hikaru at one point said he wished he could die so he and Kaoru could be the same again. :') And there is just a lot of really vicious angst over having been separated and how Kaoru went through experiences Hikaru didn't. (It could go both ways but it doesn't because Kaoru is a huge idiot for Hikaru \:D/)

What might be a problem now is that erasing EC would mean erasing ever meeting Elliot, so he might want to revise it a little so he can still have the opportunity to know him somehow.

What would Hikaru think of the whole EC situation and resulting mess?