What is the obstacles, challenges and problems that Bitcoin can face it in 5 years? How we can help Bitcoin to take more authoritative place in the world of currency system?
Well the number one obstacle is scalability, if we assume the last 5 years will triple or quadruple in the next 5 years, we would need 3MB or 4MB blocks.
So segwit largely has this under control for the next year or two, but then in 3 years you would likely need Segwit + 2MB blocks.