I wonder why people keep talking if hive's dying, hive is the biggest Warcraft 3 forum out there. On our forum we only have 10-20 active users and we think that we're actually quite lively. Hives get tenths and hundreds of posts everyday either on the forums, maps, models, skins, spells etc etc you're just lazy to look at them or you just don't see them because they're all over the site.
Conclusion: Its just your imagination.