What would happen to FOREX if BTC is adapted?

[Eebertay]

I started to think about forex if btc slowly became adapted (or some other coin)

What would happen to forex?

Say a mcdonalds hamburger cost .01 btc (for arguments sake) in the USA, this couldnt be the case in say venezuela.


Am trying to think theough how an adaptation of btc would affect forex because if there is one currency, that would create a lot of disparity

What are some thoughts?