Bitcoin is a scarce digital asset. The demand is rising as you can see with the help of rising transaction numbers. The supply will drop 50% in 07/2016.

1) Demand for BTC rising permanently
2) Daily supply halving in 07/2016
3) Price skyrocketing before 07/2016 because of speculation
4) Price remaining significantly higher than before the price spike
5) The incentive for the miners will be held alive because of higher BTC price despite decreasing supply.

Thats just my personal opinion but also for sure a very likely scenario :-)