I think the reward halving should have a positive inpact on the BTC price but it really depends on what happens in the mean time.
Anoher exchange may get hacked or crash, anything could happen so even if we do see a 200% price increse just after the halving this may be a increse from base price of anything from a few dollard a coin to $2000 a coin
The halving of 2012 led to an increase of 10'000% within 1 year.