Having done academic and some professional work in both linguistics and NLP, I would be inclined to say that the two do not have much overlap in expertise or application.
That being said, that link is no more tenuous than that between syntacticians and phoneticians, and I think it's about time to two broad classes of NLP and linguistics welcomed each other as first-class citizens.
The tag structure on StackOverflow works exceptionally well in ensuring that you see content that is relevant to you while still getting a taste of what others in the community have to offer. This would give people ample opportunity to ignore NLP questions. I say bring it on!