If an article is available for free immediately, there's no need to spend $6K to make it available at all.
Researchers want to be in specific locations because of their prestige. However, when all US-funded research is also available outside that location, the walled garden of prestige becomes rather porous. Especially since the reviewers typically aren't paid either.
In contrast, the government could easily fix this by simply not providing the money currently required by such journals, which would force them to come up with models that can work with lower fees.
I hope you are right though!
Well, not by most of them, but promotion boards usually contain academics. Part of the solution would be the slow one-funeral-at-the-time one of waiting.
You are assuming researchers are saintly figures dwelling in a vacuum who don't need to constantly prove to their department head or promotion evaluation committee of their worth. That is not the case. The walled gardens are desirable for some because their social functions are not easily replaceable.
One way to decouple the evaluation of scientific output from the walled garden is simply to stop using them as a gate-keeper in making hiring and research grant distribution decisions. But apart from the constant lip service, there is no momentum in doing anything concrete about this in academia.
Specifically, online academic publishing is, at its core, indexing and hosting pdf files. It is some work to do a good job. But it's also quite achievable to re-create the same service without asking for much, if anything, from authors. Given a little funding, every field could use arxiv or their version of arxiv (which is free to publish on). The bottleneck to a large-scale change is the self-sustaining prestige of a paid journal's badge.
As a first step, we can spread awareness among authors of how crazy it is to pay so much to publish.
It'd be nice if there were just a different model. I do a lot of research in a niche field and would like to publish some of it. But the enormous submission fees are unaffordable as a non-academic with no connection to grant infrastructure. I had thought that rigor and reproducibility would be the main hurdles, but it's pretty discouraging to have or be close to publication-quality datasets and discover how steep the financial wall is. I was aware of submission fees for papers, but until recently had been under the impression that they were an order of magnitude lower.
I don't know much about academic research, fyi.
I think it's also a midway proposal for other reasons. The proposal merely suggests open access but barely specifies anything. I don't want to give the government personal information and enable endless tracking to them just because I want to download a paper.