Not sure what the relation between YC and Reddit is these days, but wouldn't HN be in the prime position to take over? I feel all that is needed is to add sub-hn's. Reddit got Digg's business because Digg gambled away all of it's good will. That was a long time ago, Reddit since been going down the same path.
Point is, all these companies are trying to monetize, generate profits, like they somehow responsible for the value the users are creating. All they're doing is hosting bunch of python scripts.
Swallow your pride reddit, you're nothing but a message board and you don't own a single word your users type.