There's a fix already. After the bell starts chiming the marines go on the hunt. By that time everyone has big guns that tear through chambers easily. So marines will start ripping apart any leftover chambers in their search. Also, the regen noise from chambers is loud, so even if it's inside a vent, you'll hear it. Jetpack marines can flush them out, along with grenades.
The constant beeping noise is a reminder that the alien team has lost. If it goes on for too long, marines know there's someone sitting near a defense chamber.
That delay balances things out by giving alien players some time to rebuild a hive and make a comeback, just in case the marines pull some daring tactic, but forget to hold the area. Defense chambers SHOULD heal any aliens in the area to give them enough time to rebuild. I've seen it happen before.
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The constant beeping noise is a reminder that the alien team has lost. If it goes on for too long, marines know there's someone sitting near a defense chamber.
That delay balances things out by giving alien players some time to rebuild a hive and make a comeback, just in case the marines pull some daring tactic, but forget to hold the area. Defense chambers SHOULD heal any aliens in the area to give them enough time to rebuild. I've seen it happen before.