I'm an enchanter and at low levels where I am there seem to be plenty of tanks (mainly war and sk), healers (mainly sha and dru), and other enchanters. And monks. It's always DPS thats in short supply.
Whilst a server can never have to many clerics, warriors or enchanters, they do have very specific roles which people either enjoy or they don't. Think about this carefully. Personally I hate being on main heals, so would never play a cleric. If you want to play one of the three core classes, enchanter has the most versatility.
But if you're considering wizard, I'd go for it - people will love you for ports as well as for good DPS, and AFAIK they are not that common in the end game.
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