Bro, I've ben playing this game for over a year, tons and tons of T1-3 fractals, a few raids and lots and lots of meta events. I have never, ever seen a single time where anyone kicked me for playin a necro, much less been in a group that kicked someone for being a necro. I'm gonna call BS on that.
Live your own life, play your own game. Who cares if a ton of people play it? Its a well designed class...