I wonder if an idea for "scaleability" for #bitcoin l1 in the future looks like some sort of co ordinator putting txs out in batches kind of like coinjoin rounds. Like, you broadcast your tx with the amount that you want to pay in fees and then the co ordinator takes all the inputs and outputs and sorts it all out. Would be good for privacy potentially, and perhaps power in numbers of people willing to pay fees would help the group txs. Probably wouldn't save any blockspace though would it? Still going to be lots of ins and outs.

Thinking in terms of people using bitcoin as a monetary layer and how large numbers of people can do that with finite blockchain space.