I agree to a point.....
There are some classes/archetypes I'd like to see only because I want to see those classes or those archetypes, the CG paladin or Arcane Ranger. One of the items I think WOTC did right with 4th was in 4th edition was a cross class system where you can take 1/2 classes and make combinations to make you character and this made the game more modular. I personally think people have a certain idea of a character and hope that classes or archetypes will come out to create the character.
Archetypes are cool because rather than making new classes they make the current classes more modular to allow expansion w/o flooding the game system.