Why is it that lightning can't expand sufficiently? I don't understand what the practical limit is. If, in a few years, we have a $25 totally-automated, plug-in-and-forget it node for every household, why can't lightning be as fast and useful for everyone as it is for those of us using it now?
Discussion
The UTXO set is limited as well as our capacity to open channels while channel factories may help with the latter.