Ethereum has turned 10 years old. And instead of looking back, the team behind the second-largest cryptocurrency is laying down a bold plan for the future. The Ethereum Foundation has released a long-term roadmap called the “Ethereum Lean Plan.” The focus: scale the network massively, keep it online 100% of the time, and prepare for future threats—including powerful quantum computers. Big Goals For The Next Decade The Foundation says Ethereum will continue operating with no downtime, just as it has since its launch in 2015. The team wants to make…