As Geoffrey Moore describes in his award winning book "Crossing the Chasm", disruptive innovations tend to have a gap or chasm between the first two adopter groups (innovators/early adopters), and the early majority.
This is where we are right now folks.
There will ever only be 21 million coins minted. Ever. If you think about it, that means that bitcoin can only go up in value, essentially, forever.
Here are some other reasons, if you're not sold yet.
old:
bitcoin will lift the unbanked of the third world from poverty
allows for remittance for poor immigrant workers with no middle man
consumers can rest easy knowing their money is safe from hackers, unlike credit card users at target, home depot, etc
new:
next halving will cause more demand for limited supply
billions of dollars of VC being invested every month
stock market plunging, world wide economic collapse seems imminent. people of the world will use bitcoin as a hedge.
Cut your stock market losses before it's too late, invest in bitcoin! You have been warned since bottom at $275!
The 21 million doesn't mean much really. The decimal point can be moved around. You would still need to go through a middle man to exchange btc to local currency for remittances. How exactly is btc going to lift the third world out of poverty? Many btc holders have already fallen victim to theft, and many more will in the future. People of the world won't suddenly turn to btc in the face of economic collapse.