You can batch open lightning channels, and it doesn't take many in a batch to effectively amortize away the txins and change. 

petertodd

The numbers are about txouts, not transactions. They're assuming LN channels are batch opened, which is already implemented and commonly done.

Yes, its hard to know how much block space LN will consume.

I was just surprised that these numbers would mean that its possible to have over 20k TX per block. I see 3-5k at the moment, but I don't think I've seen more that 6-7k. Is that because some TX have batched outputs? 

This is only for the outputs of the transaction. Would actually be much smaller in reality 

benthecarman

bitcoin

Soft-Fork/Covenant Dependent Layer 2 Review

This us the first I've heard about being technically able to open 1.1 billion LN channels per year. 