It will be profitable if you buy bitmain s9 miner and run it in your home rather than buying 15 TH/s from genesis mining.
Profit with cloud mining? I don't think you will be able to pull out what you have invested in buying those 15 TH/s power within a year or even more than that.

Bitcoin mining is not profitable right now if you can't have very cheap electricity and latest mining hardware.

Lifetime contract on genesis mining will stop if those contracts can't pull out enough bitcoin to pay maintenance fee which can happen within few year if mining difficulty keep on increasing in the same ratio it is pumping right now.