While I agree with you on Bitcoin safety (your portfolio is safer because the only thing keeping BTC up is speculation), I don't think you can say the Austrian school is fantasy.

It hasn't been attempted and I think deregulation / decentralization of the economy has good chances of getting rid of boom/bust cycles.

Without a central bank playing with credit you wouldn't have boom / bust cycles: what's more likely is that you'll find smaller players doing boom / bust cycles in different industries with far less damaging effects.

I sympathise with the libertarian ideas behind BTC, but it's also the most inefficient and power hungry way of reaching the goal. This is a political problem and we need to solve it politically, not technically.

Boom/bust cycles preceded central banks.

Sure, but the problem was similar: unbacked money printed by banks and used to prop up the economy.

And they were a lot worse when no tools existed to mitigate.