Lightning Network
Shout out to 1ml (1ml.com/statistics)… For the Lightning Network to succeed, and for Bitcoin Core to have any real shot of long-term survival by utility / usage, we are going to need to see an order of magnitude or more of bitcoins move on to the Lightning Network. As it stands right now, one nefarious actor could drain the entire capacity of the Network. No doubt on-chain scaling will come. Further, off-chain scaling will also play an important role. The only real question is which combination provides the end-user utility. The one (s) that do, will have significant adoption in the coming years.