I think so. Psychology, pseudoscience/pseudopsychology and pop culture / mass media play too big a role in peoples' lives. A psych grad student was telling me how diagnoses of multiple personality disorder picked up big time after TV shows started featuring people affected with the disorder (almost all of whom probably just had underlying psychological issues or dissociative amnesia). In general, I think that slapping labels on people is just an easy way to keep the general downside and unrest of our culture quiet; it's a way to cover up that keeping pace with societal expectations and pressures is making a lot of people unhappy.
As for the influencing of MBTI, I don't think that it changes anyone's behavior. If anything I've read, particularly from ENTPs and INTPs, that reading about the character typing gives them a sense of calm; no, you're not crazed, you're just a different person from the XSXJ mainstream. I don't think that MBTI makes people want to conform to their 'type' further, though I have to say upon reading descriptions for INTP I began to look at myself more objectively. If anything, the typing would give people greater confidence, as they would come to see themselves as different and acceptable personalities in their own right, as opposed to incurably flawed versions of other characters.