Useless as it may be, the entire Tamagotchi hive seems to be functioning very well. It has been up for a few months at the time of writing, and I have not had to interact with any of the 13 Tamagotchis myself: the Tamagotchis are taken care of perfectly well by the AI and seem to be having a good time.
There is one thing that may make it necessary for me to manually set a few things straight, and it is not because of a design issue but more because of a general biological problem. Whenever two Tamagotchis mate, they will eventually be replaced by two new Tamagotchis of a random sex. With only 13 Tamagotchis, however, there is a chance that at a certain point in time, all the Tamagotchis in the hive will be of the same sex, which would eventually make the hive die out. That is why I still keep an eye on the hive every now and then.
In general, this was a nice exercise in emulator programming. The end result isn't that useful, but hey, it's the journey that's important, not the destination.
If you want your very own Tamagotchi Matrix, I released all the sources on my Git server. Do a
git clone http://git.spritesserver.nl/tamatrix.git/to get all the goodness, and I'd be very interested in hearing from you if you do something cool with it.