If the 470 went to became a mixed event like Nacra, with a crew of 1 men and 1 woman, I wouldn't be pissed, to be honest. I never understood the difference between 470 and 49er ship, so if 470 becames mixed I'm happy and fits for me.
About the Finn being mixed, I don't know. Really, if it is a team event I would love to see mixed regatas, and the result points are added to a team, could make for a more interesting event than individuals cause two ships are involved per country and anything can happend.
Mixed kite, meh. It's a different enough event to all the other sailing classes, I really hope IOC would give World Sailing one more medal event so they can have different sexes events in this one and made a great debut at the games.