Your thoughts on "new fans" (I'd consider myself one, having watched the new movie before seeing every episode of TOS) remind me of music elitists who become upset when their favorite band gains mainstream popularity. Y'know, the whole "Well, I was a fan way back before their FIRST album!" ... "Yeah, well, I saw their first live show! So there!" nonsense.
While I'm astounded that I managed to spend the first eighteen years of my life somewhere other than the Trek universe, most long-term (?) fans I encounter are simply happy to hear that I want to be part of the fandom (and now I own every series aside from the animated one).
... Only after typing this do I realize that PhasersOnStun
gave a more pertinent example of my first point.