is creating a wall that makes it harder for BTCto be a universal economic currency. Stores may take 1BTC for a product and in the AM that 1BTC could be valued at .08BTC. Obviously theres a ton of positives to this happening I think more than negatives. I for one hope it does though because USD is getting old 
Bitcoin being volatile and unpredictable in nature are characteristics of bitcoin that makes bitcoin as bitcoin. All just have to deal with it. If the scene you stated is a big deal then why not convert btc to fiat immediately after the transaction so that no value will be lost.
It is blurry to see bitcoin as a universal economic currency because not all government will compromise to bitcoin. Some might accept bitcoin as a mode of payment but they will not entirely embrace bitcoin and forget about their original currency.