Ask HN: What will happen to new transactions once all BTC coins are minted?

Has anyone given serious thought to how will new transactions be settled after all 21M BTC coins are mined? Will this create a spike in transaction fees to reincentivise miners? Will the protocol be changed to allow for more coins to keep miners busy ( thus introducing inflation)? Will transaction times be lengthened? Will some transactions be dropped? How will all this affect the terminal price of and confidence in BTC?