It seems like all the newer SE sites are named topic.stackexchange.com.
Just to keep everything orthogonal what about adding serverfault.stackexchange.com as well and point it to serverfault.com?
This would seem logical, except none of the trilogy (SO/SF/SU) are accessible this way -- I believe the trilogy sites are still "special", and there might be a bit more involved than just the name...
If it is possible without requiring the sacrifice of a developer during the full moon I heartily approve though.
I wouldn't see much of a problem coming from redirecting serverfault.stackexchange.com -> serverfault.com. But I'm sure the codebase uses the hostname of the site, so I doubt it would be trivial to add alternate hostnames to sites.
Arqade (gaming.stackexchange.com) already does this in the reverse, arqade.com -> gaming.stackexchange.com
because I want it
isn't a reason? It may not be a good reason, but it is a reason.