Please find a flaw in this: I can send $1B with a fee of 40 cents or less.
That is not a use case for the broad population. For the broad population there is no use case, other than as a get rich speculation.
Use cases?
1. Remittances -- very low fees compared to 10-15% of companies like western union
2. Self storage - Your accounts are not able to be "frozen" by 3rd parties
3. Portability -- You can travel to any country and immediately use your bitcoins without needing to transfer funds from one bank to another or pay additional currency exchange fees. If you tried to travel with a suitcase of cash you'd soon be broke/robbed
4. Not able to be used in Bail-ins: Example Cyprus stealing money from large account holders to bail-in their banks. And actually the G20 just agreed that bail-ins should be used before bail-outs by the IMF or the central banks....we are going to see a lot more bank failures and bail-ins in the near future
5. Known inflation/emission rate. : Take notice of argentina, or the QE in USA
6. the list goes on and on but if your too lazy to look them up then I'm going to stop here.