OK, pickles, sorry I missed the compliment - it was a bit hidden :) You were assuming I would agree that there is 'screaming' about banning formula, I think, I don't think there is anyone calling for that.
Hilly, more bf would save taxpayers money, yes, for sure.
This has been worked out in several studies.
You say: "we fail to factor in all the things I said earlier about a hypothetical situation where FF was banned or if you can imgine a scenario where it just never existed at all. " Well, of course we fail to factor in those situations. There is no need to factor them in. All you need to do is to factor in a hypothetical situation where more babies are breastfed for longer and use less formula milk. You can do this pretty easily with stats from the cohort studies.
"I imagine there would still be costs to the taxpayer, they would just be different costs, forgotten about and unanticipated, because it's so long since we've had a society where the vast majority of babies were BF that we cannot imagine what those costs might be."
???????? It's not a question of 'imagining' anything! To take just one example: You know the cost of treating a baby for gastroenteritis in hospital. You work out that treating XXXXX babies in hospital for gastro, and then work out what this would be if fewer than XXXXX babies were treated in hospital for gastro, as we know what the lower number would be, if more babies were bf for longer. This does not have to mean breastfeeding until mothers go back to work.
If there are extra costs associated with continuing to bf, then you would need to add these on, but if you were more familiar with the research (not a barbed criticism) you would know that working would not be one - working is not really significant in the length of time women bf for. In individual cases it may well be, of course, but once you start to research 1000s and 10s of 10000s of women, this becomes insignificant.