If they nerfed RDM so your sentence would change from this

Quote Originally Posted by Zetic View Post
why bring a blm or smn when you can just take a rdm or two.
to this

Quote Originally Posted by Zetic View Post
why bring a caster when you can just take 4 physical damage dealers.
Nerfing RDM would not magically make BLM and SMN shine, it would just throw the only currently viable caster in the trash with the other 2.