For us who have multiple 90 classes which we don't enjoy playing anymore, bliz should add a feature allowing us to perm-terminate a lvl 90 character. For each 90 you terminate you can get a month of free play time.
edit:
To those who were asking about the logic behind this and difference between "termination" vs deletion,
I have deleted all my characters in TBC once, after WOTLK launched I called blizzard and have them restored. All of the characters (6 70s iirc), after like half a year, free of charge. Yes, you heard it right. So character deletion means squat, they still save all the information on the server. This perm-termination will be non-reversible and thus can free up bliz server space in exchange we get some free play time.
I understand one month free play time is a little too much, how about 10 days? And it has a once every months cooldown per account.