Dramatic enough for frequent visitors. Forums are dime a dozen, but a community you get used to and grow to like is unique for you. If HN was to be suddenly shut down, I'd literally be heartbroken.
I mean, if everyone preferred to leave anyway, then it would be an empty gesture to shut it down.
If everyone preferred to leave, this would be a non-issue. The problem is, the only people who seem to be in favor of leaving are the people who aren't using it in the first place. On Google Groups, everyone is in favor of shutting it down. On Reddit, everyone is begging for it to be left up.