They stopped forum name changes because it broke things for the user on the combined community sites and created too many headaches. They would only change the name in extreme cases (e.g. name was vulgar or created a security issue). Since a lot of the features that broke are being removed with the forum revamp, perhaps they will consider re-opening the forum name changes again.
"Everyone's got one. Better to be a smart one than a dumb one." - me
"It's people like you that [I]think[/I] you know everything that give those of us that [I]do[/I] a bad name." - me
"Eat, drink, and be Merry, 'cause Pippin was a fool of a Took."