Quoted from Astropin:I think as long as there is a need for loans there will be a need for banks. I'm sure they'll still provide some custodial services as well...for a small fee.
Let's say Bitcoin does become the global reserve asset and unit of account. Banks will still provide loans and custody peoples bitcoin (the ones too afraid to self custody...which will likely be most people). Are they going to pay you interest? NO...but why would anyone need them to if the value of money itself rises over time?
Why would people use them if they paid no interest? The only reason people kept their money in banks to begin with was safety and interest, without the interest part people would just put it somewhere else.
Back to it being used a currency, it would never work because of the disincentive to actually invest/borrow. For example, take a farmer. Now normally they take out a loan, grow crops, the land appreciates and when they hit 60 the land is paid off, is worth a lot more and they can retire by renting the land or selling it.
Now move to the bitcoin way. The farmer actually can't take out a loan on the land because the land is depreciating every year, and crops grown every year are worth less and less...no banker will make that loan. So there's no incentive to actually become a farmer at all. In fact, let's say that you started out in the best possible scenario ever, you owned 1000 acres free and clear to start. Time to start farming, right? No. Because the land depreciating and the crops are depreciating, you sell the land and just sit on the bitcoin instead...it's more profitable to produce nothing than to actually make crops. Why work for no gain?
And there in lies the whole issue, in the current economy assets are everything, the currency is becomes more and more worthless. In what you're proposing, the currency is everything, and assets become more and more worthless. The reason that doesn't make sense (besides the deflationary aspect of it) is because say you have Warren Buffett...he became rich by investing in businesses which produce goods and services which people consumed. In your world, Warren Buffet would become rich by doing nothing, in fact the less he produces/consumes the better. Instead of creating an electric car company (Tesla) or the biggest retailer (Amazon) or the most popular consumer electronic company (apple), he just did nothing and allowed his bitcoin to become more valuable over time. There would be no investing because instead of debt devaluing due to time, it would increase in value over time and become suffocating.
Because when it comes down to it, you need food, shelter, energy, etc and the money is somewhat irrelevant, it's just a medium of exchange. The only thing good about a bitcoin currency is that it would limit government spending, which is the real source of the money issues today, not the 'hardness' of the money.