I mean yeah that makes sense - but I've personally not seen examples of prefigurative building that have rejected funding and resources from the old system on ideological "purity" grounds - quite often the reason is that established systems just refuse to funnel resources into alternative systems that don't generate a profit.

As an example - I was involved in a waste reduction/swap shop (food, clothing, furniture, etc) cooperative that due to it's well established social value was getting council and some governmental finding for over 10 years - everyone involved in it would see it as a prefigurative example of the future of society of fulfilled low carbon living. However, due to austerity cuts and a profit seeking landlord, who was asking for 10 grand a month in rent (which was over a third of how much the coop was making) once the council could no longer funnel money into the landowners pocket - the project was no longer viable and folded.

Now do you think the people that were involved didn't do everything in their power to keep the project running? Not in the slightest - it's just that the system is so hostile to such endeavors that they're constantly fighting an uphill battle where one slip is enough to send you all the way down.

So while I do agree that ideally we'd funnel resources from the old to the new - time and time again it's been proven that relying on the existing precarious system only results in building on weak foundations that will take you down with them when they inevitable collapse.

And I'm not saying this to dissuade you from pursuing a dual system theory - I'm genuinely trying to figure out a way where we can build the sorely needed infrastructure of the future in any way possible - in a climate that takes 15 years to approve a 50 square feet low traffic street to pedestrian area conversion in a time where we're 25 years away from unprecedented climate catastrophy.