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RE: New Video: What's Proof of Work and Proof of Stake?
so once all bitcoin is "mined", miners will have to rely on network fees alone as incentive which I assume after 100 years from now will be well worth it!!
Correct - the problem here is that we need to be careful that the mining fee doesn't skyrocket, making the currency less enticing to use on a day-to-day basis. Nobody wants to pay $1 in transaction fees every time they buy a coffee. Some of the work on payment channels (see Lightning network) address this but are in the early stages and the technology has not yet been proven in the real world.