But then, what is uncertain is regulation, can cryptocurrency grow into a multi-trilion market without the proper regulations?
Simple answer: No. To be accepted in the mainstream market, proper regulation should take place. Even if the cryptomarket is booming, if the government find it unregulated, they will do their best to halt the growth and implement the regulation in it before allowing it to grow further. Regulation is always a partner of government adoption and implementation to its citizen. So as much as we love the word decentralization, the government will never allow it.