Seto is pretty much a coward, which is what causes all his problems in the first place. But at least he's consistently cowardly. If he was just a coward at the key moments when he fails to confess, etc, it'd be far more annoying. So, I'll try to deal with it. It'll be nice when he finally overcomes the cowardice and does the right thing.
And so, now he's on a vacation. Because it seems Itsuki is thoroughly out of the picture (at least for now) There's gotta be another character introduced to cause problems and confusion. Probably a girl with an I name. This is I"s, after all ;)
A vacation is a big enough plot point, and common enough time for these stories, to introduce a new character... likely She will somehow get in the way of him speaking words to Iori like a person. Whether directly, through misunderstanding, or whatever.
Let's see how it goes.