Like most of us here, I don't sail a keelboat (ever) and rarely a dinghy. I think it's a stretch to consider keelboats remotely "athletic" (other than maybe for a grinder). It's always amazed me that they can be considered a "sport."
Anyway, I totally agree with Jake, the Moth (or something like it) should be in, looks very athletic, not to mention exciting for viewers.
Sadly, I agree that MarkMT is probably also right on, they need to generate funds, which saves the keelboat.
So, if we accept that keelboats will never die in the Olympics (and accepting that certainty may save us all a lot of hair in the long run), we really only had 8 positions in which to squeeze at least one multihull event. Still unclear on how that wasn't possible...
Mike