Even massive developers like Blizzard never quite get a game balanced right in one try... hence why Diablo 2 had 13+ patches that primarily focused on balance. It will be the same for Diablo 3, I'm sure.
That the AS update beta failed to balance should not have come as a surprise to anyone.
While I do believe that a more optimal balance is readily attainable, there is no longer any incentive for Dylan to put all the extra work in. To appease his fanclub? Ehhhh, no matter how good another update might turn out, there'd still be some people who whined and moaned about it!
This game has never really been about fair and universal competition. There are dozens of versions of any given track, scoreboards are readily hacked, and the characters by their nature will always be imbalanced on any given song. What this game has always been about is duking it out on songs you like against people you know from the community. Thus, if you want a good battle on a sweet track, get your mates to rename it with [as-lol] and agree to only use whichever characters.
As for me, I just play for the aesthetic and to see if I can best my own records, now!