As a number of mainnet LN nodes in Bitcoin continues to increase, I anticipate that more and more people start using Lightning, which would ultimately lead not only to scalability in terms of transaction throughput, but also drop on-chain fees to even lower bounds, following the transactions shift to the Lightning Network.

One of the remaining important things to do is to make LN more accessible and user-friendly for the general public. Initiatives like the Spark Wallet are great examples of heading that way.