Bitcoin also needs fungibility:
"Fungibility is the only property of sound money that is missing from Bitcoin & Litecoin. Now that the scaling debate is behind us, the next battleground will be on fungibility and privacy. I am now focused on making Litecoin more fungible by adding Confidential Transactions." -Charlie Lee
Not without an increase in the block size, which has been a contentious issue. At 7 transactions per second, it would take 31 years of full blocks for every person on Earth to just open a Lightning channel each, in uninterrupted succession.