it is today easier to quickly convert from bitcoin to fiat and back, but as a merchant you still have the issue of pricing the items and book keeping and so on. this is still not to easy, but i think we will get there.
Many exporters (and I guess importers as well) are essentially in the same conditions. For proper accounting and paying taxes they have to convert their export proceeds in foreign currency from that currency into their national currency. They may also have to sell some part of the profits earned to a local central bank or on the currency market. In my opinion, Bitcoin as a means of payment and currency in its own right should be treated accordingly, i.e. as a foreign currency...
Until governments decide to use Bitcoin as a legal tender, of course
the other thing is that government are familiar with this process with the big currencies. if you have an unusual currency or bitcoin it is somehow harder for them to deal with it. just for tax purposes they have daily exchange rates you can use and nobody will question this, but with bitcoin you would need to do extra work and prove and document everything. nobody likes extra work.
I certainly understand the pains that a lot of merchants wanting to use Bitcoin along with their local currency might feel. But with or without Bitcoin, they will have to tackle this issue of dealing with foreign currencies sooner or later, and I would say rather sooner than later, especially if they want, for example, to go international. Many online resellers like Amazon are selling their goods all over the planet as payment processing platforms like PayPal commonly and ordinarily handle the conversion of a multitude of currencies...
The world is definitely becoming a tighter place over time
