There's no use expecting anything from the publishers. Universities and independent archives need to do the job.
https://blog.archive.org/2020/09/15/how-the-internet-archive...
As for arxiv, they already make the full dump available:
https://info.arxiv.org/help/bulk_data.html
Even for works not published on arxiv with a Creative Commons license, the basic arxiv license gives them the right to do so:
https://info.arxiv.org/help/license/index.html
You can torrent the arxiv dump with Internet Archive torrents:
