Muslims are the currency of Islam.
According to most recent statistics, Muslims make up roughly 22% of the world population (and growing, alhamdulillah).
At some point, the population of the ummah will force a change in the economy to make global and local economic exchanges shariah compliant.
At some point, the population of the ummah will exceed the populations of other religions – becoming the world’s largest religion – forcing a change in social order to make global and local social exchanges shariah compliant.
Rather than fearing shariah, look into it. It isn’t as scary as it has been made out to be. Quite the opposite, it is just, it is fair, it is practical, it is precise… it is stable… it is that social shift many have been revolting towards (but never quite getting right), praying for, dreaming about, and writing and theorizing about… Alhamdulillah, it has always been in motion and growing, and insha’Allah it will bring stability to the world.
Towards Falah 
With a key like Surah al-Fatiha (the opening chapter of the Qur’an) where a Muslim recites the verses at least 5 times per day, over the course of 50 years every single Muslim would have recited the powerful verses at least 91,250 now multiply that by the world population and you can see the power of such currency. SubhanAllah! (These notes are based on one of Shaykh Husain’s talks.)
Let’s be conservative and assume there are currently only 1.5 billion Muslims worldwide and that only half of those Muslims pray obligatory prayers… now try to imagine all those who have come and gone since our beloved Prophet صلى الله عليه وسلم – and those who are yet to come… subhanAllah! A number that is difficult to comprehend. All reciting Surah al-Fatiha.
All in remembrance of Allah Ta’aala…
And what about all of those Muslims who have come and gone since the time of Adam (as) – Muslims before the time of our beloved Prophet Muhammad صلى الله عليه وسلم
SubhanAllah!
Allah Ta’aala is Supreme, Most Powerful, Most Magnificent, All Knowing.
That is the currency of Islam!