A currency can be deflationary and be used in parallel with other currencies that are inflationary. Just because one currency is -relatively- deflationary, doesn't mean that the economy goes to deflation.
The "bitcoin = deflationary = bad because deflationary economies don't work" argument is flawed because it is based on the assumption that national economies are based on bitcoin, when they aren't.
Even if bitcoin was the sole currency worldwide, the major problem would not be the currency, but the fiat debt scheme that needs to be "serviced" with interest - something that a finite money supply doesn't allow. The unserviceable levels of debt are a far bigger problem than the currency. Inflationary currencies just make debt more "viable" in order to perpetuate debt-slavery for nations and individuals. And this is not predicted to stop anytime soon.
Bravo!
A finite / deflationary currency should be irrelevant to the inflation or deflation in price of the goods that are traded in that currency.
People have been brainwashed by decades of central bank market rigging and money printing to believe that a deflationary currency is somehow evil. It is, but only to central bankers.
There are many reasons for goods to become cheaper, some 'good,' some 'bad,' but it's time to unshackle your minds of the currency you use to buy those goods having anything to do with it. It does in the current kick-the-can banker-debt-farce, but it really should not matter.
'Service' 'industries' like banking and the whole financial sector are not and never will be creators of real growth, value or prosperity. They just suck money out of the economy at the expense of he rest of us.