Correct me if I dont fully understand the concept of bitcoin. If miners currently work for new bitcoin, then once all bitcoin has been mined, I assume that the only incentive for them to continue running is to collect transaction fees. In order to offset the cost of their rig and electricity, wouldnt their fees need to increase in order for them to make it worth their effort?  Isnt that bad for anyone who wants to use bitcoin as currency instead of investment?