The Future of Cryptocurrency Begins in 2018

The big markets for 2018 are: cryptocurrency security, cryptocurrency smartcontracts, cryptocurrency consulting, cryptocurrency law, and cryptocurrency technology.

Given the number of markets one might pursue, one might ask, "how many people are actually spending money" and what are they spending money on?
To my dismay, a simple Google search on this quoted text, yielded no results.
This is a simple question behind all of the advancements in technology which allowed for the expansion of finances, retail, real estate, and so forth into a complex system of exchanges distributed across a seemingly endless network of blockchain servers.

The big question of 2018 is: Who is going to build the cornerstone exchange for the ever growing expansive array of cryptocurrencies?
With each new publicly credited and review backed cryptocurrency exchange released, more options for currency are available, transaction times are faster, and previous forerunners are found overwhelmed by the result of public cryptocurrency adoption.
Having worked for a few Fortune 500s myself, I believe we will see the rise of new companies that exchange at fair rates globally, that are economically, fiscally, and socially responsible.
The big questions for these companies will be:
How do we build systems that support 7 billion people and counting?
What technologies are efficient, fail proof, and expandable?
How does artificial intelligence affect our employees, customers, business, and finance?
What do we do with all the trash?
How will this affect our population 10,000 years from now?