i would venture to suggest, that even better than that is the changeling psion/chameleon/mindspy. that can literally be anyone, and anything.
i play almost exclusively psionic classes these days. it's become a challenge to me to fill each and every party roll i play with something psionic if possible. so far, i have been able to do so.
my dream class would be a psionic version of a beholder mage, without the beholder. they learn like a wizard, cast like a sorcerer... or in psionic terms: learn like an erudite, manifest like a psion.