Sure, but I think non-preprint cultures would instantly become only-preprint cultures because I believe (and this might be folly) that most researchers rely on

Sure, but I think non-preprint cultures would instantly become only-preprint cultures because I believe (and this might be folly) that most researchers rely on work they are confident about based on experience with the authors and details from the paper. I don’t know if this is that bad of a change since I admittedly do this already.