What do you think will happen in 2016 when the next halving is going to happen ?
1. Bitcoin will keep almost same price, and miners will just get half the BTC.
2. Even tho we will mine half bitcoins, bitcoin price will explode just because it's harder to mine.
Which one you belive is more probable to happen ?
I believe it will be scenario 1). Everyone knows the change to mining revenue is coming so it is something people can include in planning.
BTC prices may rise slightly before the halving and fall afterwards, as been mentioned by others. I would be surprised if there was a massive change in bitcoin price.
It is also worth remembering that by 2016 almost all mining will be done in large mining farms in areas with cheap electricity. These people plan ahead and will plan for the revenue change.
But mining will be greatly affected.
1) The value of the mining industry will halve overnight. Suddenly there is half the revenue. So mining farms will keep marginally profitable miners running up to the halving date and then turn them off.
2) Difficulty will fall as uneconomic miners, and mining farms, are turned off. In theory difficulty will fall to half the value before the halving.
3) Sales of new miners will collapse in 2016. People will want to see how the new mining world stabilizes. In particular people will want to see how fast miners turn of older miners, and the effect on difficulty. Some mining farms may even run at a loss for a period in the hope that others go under first. Those left standing after the shakeout will get the spoils. In the second half of 2016 there may be a glut of cheap uneconomic second hand miners.