It's for the good of bitcoin and rewards of miners will be cut into half. This will make the demand even higher so if you're worrying about it, the past halving did result in good price of bitcoin. 
But I guess it's not really that good for the miners because blocking halving means not just the rewards will be cut into half again, but also means upgrading their hardware. Imagine the expense if you have a mining farm.
The mining farms that have invested a large capital won't let their farms to shut down because of that. They will keep themselves on the trend unless they can't keep and take the expenses anymore.
Agree, these big mining farms would be the last to stand until the last Bitcoin is mined. This expense is just a one time upgrade in 4 years anyway, and I guess they could easily handle that, but then again the total amount of expenses is a pain in the a** lol
