i guess mining willl continued to be used because many people are still do minng because it ís much profitable than participating in bounty,  Also the mining process involves compiling recent transactions into blocks and trying to solve a computationally difficult puzzle.  The participant who first solves the puzzle gets to place the next block on the block chain and claim the rewards. Also do mining is need your computer to open 24 hours ,so surely the electric bill is become higher.