With the rise of Blockchain tech and cryptocurrency, is there opportunity ?

When the internet rose to popularity in the mid 90s, and when apps became heavily used in the mid 2000s. There was came about these websites that generate billions of dollars (ex Facebook) and apps getting millions of hits (Ex Instagram). Innovation about innovation due to the internet,web, and app.

What opportunity can we seize with block-chain and cryptocurrency in 2018 ?

So far we have
Buying and selling crypto coins
Mining
Providing blockchain services (skills sourcing,training, platform for banks etc)

What else is there ? lets brainstorm.

Every current financial service in the world can be renewed with blockchain technology. But, it will take big startup investments.