I've almost never seen kennels in a game (outside dual gap and the pass type maps), they die easily to any ground anti-air [edit - but not asfs - thanks for the clarification - although they do die to inties and swifties].
Out of curiousity I tried 50 upgraded kennels (100 drones) vs 1 Ythotha, which is roughly twice the Ythotha's mass cost. The Ythotha killed the drones almost instantly, taking 0 reclaim damage.
A fatboy kills 25 of the drones with just its basic AA (which are just for show rather than intended as functional AA); if it starts building a single T2 flak once the drones enter its firing range, the flak is produced well before the drones can get in range and it slaughters them.
A GC doesnt have AA but for just 160 mass you can build a hover AA unit that can stay near the GC ready to protect it from the kennel menace.
By this point I didnt bother testing Cybran to see how well the monkeylord AA performs against drones, since even if drones could damage it, the same point about escorting it with just 1 T2 flak would apply.
Granted this is before the balance patch changes, but due to how weak the drones are to aoe AA I dont see the buffs changing the result notably.
It's also a very fun feature - e.g. watching a cast and seeing a careless player let their experimental stray into range of a bank of hives and get reclaimed is very entertaining.