@wrstuv31
yeah you could used payment channel (PC) for micro payments, but this is orthogonal.
I mean, suppose that with 1 sat you could buy 2000 coffee at your favorite cafeteria.
Let aside all the technical problems related to long term PC (e.g. you have to be always on line etc etc) and that you need to craft your PC system so that it is able to deal with sub-satoshi transfer.
So you decide to open a PC with your cafeteria, you lock 1 sat on that channel, at the some point in time for what ever reason you need to settle on chain, at that precise moment you have 0.3 satoshi in your channel.
Now what are you going to do if your Bitcoin is not able to deal with sub-satoshi payments?
This is the quantity theory of money, right?
I'd call it common sense for what is worth.
According to QTM price level of goods is directly proportional to the money supply. So far so good. I don't see how this matter in the current argument we are discussing.
We are not discussing the amount of money supply in Bitcoin, which is assumed to be fixed. We are just speculating about a scenario where Bitcoin would be able to "represent" much more "value" than it is now, orders of magnitudes more. With that I mean having more than a billion people using Bitcoin to perform their day to day transactions.
In this scenario a satoshi (10^-8 Bitcoin) would be too valuable to buy a pizza, a coffe.. let alone perform micropayments (see the example above).
What has been discussed is to make Bitcoin protocol being able to cope with smaller unit of value on chain.
This has nothing to do with monetary supply. Not one bit.