So what happens when Lightening Network gets flooded with endless exchanger transactions and acceptance from more and more exchangers in the future?
Bear in mind that Lightning is still very much in its infancy. There are a lot of further developments which are in the works which we will hopefully see come to fruition over the coming years, and there will be plenty of more developments which have not yet been thought of.
Touching on darkv0rt3x's point above regarding opening and closing channels - two developments which are currently ongoing are Eltoo and Channel Factories. In short, these would allow multiple users to cooperate to make a single on chain transaction, and then on top of that single transaction open as many payment channels between each other as they like. This would significantly decrease the on chain footprint of Lightning channels.
I am still wondering why we haven’t developed the LN ti further upgrades yet? I mean from the discussion on this thread it’s clear that we know the LN capacity and how it is capable of moving even further. Why would it be still in the infancy if it’s existence is as it is since very long period of time. I have no idea about the open and close channels and how the algo works on that front end but definitely lot of developers already know significance of this but too far from developing upgrades.