Why is it called crypto "currency" anyways?
Why not cryptonumber, since that is all it is in the digital world.
The price of a bitcoin is only related to the demand ( and the limited supply ), much like art, of which there seems, or had been, a push to some sort of digital art that people could invest in.
Rive said:
Why did people started buying bitcoin, to start with?
For the fun it it at the beginning, as it was something new that didn't at all cost that much, and you could start mining with minimal investment, even on your home computer. Now there are farms cranking out numbers as they are staying in it for the long haul, and using energy resources for little gain to society.
As the OP says, widespread use, if it ever becomes that, can end up draining the economy. It doesn't have to reach the consumption of 100% of resources, maybe even just 10% would be enough to slow growth to a standstill.
Scenario - Consider, if a government wants to print money right now the actual 'paper printing' cost is somewhat minimal ( baring no rampant inflation crisis ) in addition the what other agencies do charge to get the money out there. If a bank wants to lend you some money, a surcharge is put on the loan as interest. If they have to add in the cost of mining the cryptocurrency, then the price of the load will reflect that incurred cost, being passed on to the consumer of the loan. A 5% load in normal times would have an 'inflated' interest rate, perhaps up to 25%, 50% depending. Investment drops in the economy due to the high price of money, no one can work hard enough to service a loan, stagnation and eventual and collapse of civilization for the middle class, possibly all of civilization.
I would consider the OP premise is based on something more than shear fantasy.