Irrespective of what happens to the price, the amount of bitcoin earned per block will be cut almost exactly in half (since fees are variable). The value of the coin may change compared to fiat but unless your operating costs get cut many will have to bow out.
Come on bitcoin. You've got about 8.75 months to double or triple your value or the proverbial !@#$ is going to hit the mining fan and splatter a whole crap-ton of fecal matter on miners walls the world-over.
I myself wouldn't invest in any miners until after the halving honestly. Far better to see what your prospective ROI will be once the halving has already occurred, and who knows, bitcoin has just as much chance of being worth far less than it is today as it does rocketing to the moon at this point imho.