The INTPs will never know how it feels to be chronically happy and at peace with yourself, so that makes the ENFPs the paragon of everything they'd aspire to be, one day...
Half true. I don't know how it feels to be chronically happy and a peace with myself, but I am obsessive about self-improvement. I believe I will soon ascend to some high level of happierness. There is a lot I like about myself. I would not say the ENFP is the paragon of *everything* I aspire to be.
I personally don't believe we have to be constrained by MBTI model. We can develop "character within the framework of our temperament"
I want to develop more E, F and J. I've already developed some J. I can see how I would develop E, not yet sure how I would develop F. I know of at least one person who has developed his E. He says part of him is still introverted, esp. within the context of a crowd. He wrote about it in the current issue of psychology today.