Do you have a citation for that?
https://lightning.network/lightning-network-paper.pdfIf all transactions using Bitcoin were conducted inside a network of
micropayment channels, to enable 7 billion people to make two channels
per year with unlimited transactions inside the channel, it would require
133 MB blocks (presuming 500 bytes per transaction and 52560 blocks per
year). Current generation desktop computers will be able to run a full node
with old blocks pruned out on 2TB of storage.
...
To me this sounds like we're already just 133x away or two orders of magnitude from covering whole world wide population. So at current stage should be enough capacity to meet current needs with LN.