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The tyranids would not be too interesting in fighting demons. There's no biomass to gain so they would sooner look elsewhere. Otherwise, yes the Shadow In the Warp would make a demonic incursion very unstable.

I would say Demon Hunters would not be the best choice because if it was a full blown demonic incursion of any seriousness they would be just as likely to declair exterminatus on the planet vs. going toe to toe..

On the other hand the Orks love a good fight, and an unending tied of demons vs. an unending tied of orks sounds like just the type of fight orks (and khorne) would want.