Not so fast. That's the keynesian version. That is the version of economics thats been in fashion since the end of WW2. It's because of that version of economics that we now have inflationary fiat money. It's supposed to make the money flow and thus increase GDP, and in the end everybody's wealth.

However, that system doesn't seem to work. It makes it impossible to save, and makes it necessary to borrow, witch in the end makes average Joe poorer, and makes the economy crash regularly.

The economic system used before WW2, and the system that cryptocurrencies belong to is called the Austrian school of economics. It basically says that money should not be inflationary, and people should be able to save for a rainy day. A dollar or whatever currency you use should still be wort the same in a 100 years time.
People will still consume, but they will save for their consumtion instead of borrowing for it. Bitcoin is a Austrian type of currency, and one with hyper deflation at that. Something never seen before, and a very interesting economic experiment

The future will probably see two parallel economics at work at the same time, where people will save in crypto, and borrow in fiat. This might either stabilize the economy or crash it. I think it will make it more stable, but only the future can tell.