In terms of global community, the demand in cryptocurrencies of any kind still is rather low.
When it becomes much more acceptable and recognizable by the wider audience, perhaps there is the possibility for cryptocurrency to go mainstream (even though I have some doubts about that

).
The demand for cash will go from the third countries. Their economies are very low and therefore people are willing to look for any opportunity for additional income. In the leading countries the people have enough income to provide for their needs. Why would they look for something new?