A lot of people are, and I think that's a shame.
That said, I genuinely don't think there'll much difference if we're in or out. We'll still have to abide by EU regs, we'll still need mass immigration to fill the crappy jobs, and we'll still have to argue the toss over money stuff. I do think we'll suffer economically in the short term, and I think it's a shame that my future kids won't just be able to pop over to Europe and grab a job during their gap year, but ultimately it'll just be more of the same.
I'd rather be trying to influence from the inside than the outside though, and I think that's where we'll suffer the most.