That's not even the most fundamental issue with LN though, it's not a fully thought out system. As LN node count increases the routing complexity increases exponentially, which is the classic problem of routing issues on large graphs that literally every networked system has. The internet solves this with some degree of human intervention to tip the scales to particular routes, which is something that the LN inherently can't (and shouldn't) do. There is some amount of optimization that could take place using common graph routing algorithms like OLSR or others but those represent foundational changes to the protocol which historically LN is allergic to for whatever reason and wouldn't entirely solve the problem in any case.
Simply put - it can't scale to that kind of throughput for a combination of cultural and technical reasons.
Simply put - it can't scale to that kind of throughput for a combination of cultural and technical reasons.