Today I noticed this in the original LN whitepaper: "A Funding Transaction may have multiple outputs with multiple Commitment Transactions...[One output could] requir[e] additional signatures from security services."

The first sentence suggests the possibility of batch txs for opening channels, and the second sentence suggests the possibility of multiparty channels. Those are both ways to scale up lightning usage beyond just "raise the block size." Not only can several users share a funding tx, they can also share an *output* in that tx.

Source: https://lightning.network/lightning-network-paper.pdf",