Inflation can be good for a national economy to get back onto its own feet with the currency devalueing it makes sense to produce inside the country instead of importing. Its an automated process which is usually helpful... in a currency union like the european one its not possible and thats why Greece suffers from the crisis of 2007/2008 until today. 

So maybe Btc will bring out completely new market mechanism.

Thats why its still the biggest and most interesting macro economical experiment ever.

If btc is only used as store of value not too much should change because it would work as gold but easier to to commit tax evasion.

If btc becomes a world currency the whole economy should collapse and destroy capitalism because of deflation and people not consuming. Maybe this is key to solve the climate crisis as well?

The problem is much more complicated.

Inflation of a currency is itself not the problem.  The economic problem is inflation of prices, which is achieved by inflating or deflating a currency supply.  Money is like a commodity.  There is a supply and a demand.  Imagine a good with a fixed supply and demand.  If the supply of money increases then the price goes down. Printing money causes price deflation.

You can also have the case where the population increases, and the demand for money goes up.  Here the price increases without inflation, so if you want the price to stay the same then you need to print money.

Central banks can print money and (to a lesser extent) destroy money.  They try to control prices through a complex system of debt and money.  The problem is that this can't be done efficiently centrally.  Also, they are trying to create price inflation, which discourages saving and thoughtful investment.

So whether a currency supply is inflationary or deflationary does not matter as long as it is fixed.  The big economic experiment here is how the users of the currency deal with fluctuating prices.  The view I have is that it doesn't really matter.  Without Central manipulation, people will buy less waste and more value will be created in the economy through sound investment.

All depends on what philosophy you cryptocurrency confess.

Bitcoiners say that all shitcoins will fall because they are redundant. Ethereum? It can work on Bitcoin (Rootstock / Smart Bitcoin). IOTA? Meh

And so on and so on. If Bitcoiners are right then all altcoins / shitcoins will die over time.