The "supply" is not halved. The production is halved and there is a fundamental economic difference between the two.
FTFY
well it depend because at some point if the price will not increase there will be zero incentive for them to mine, unless they have free electrcity, but even then if the price is very low, they can not add other equipments and the network will not grow and can be vulnerable
and i doubt every single miners out there will have free electricity in the best scenario, so many will simply leave the game
I am sure that the price will rise to the point that about 75% miners will be happy. Other 25% we might lose, but this won't be a big deal since we have too much of the hash power anyways at the moment. Even if we lose some, we will be fine!