Diamond open access and fully OA publishers might do that (maybe as an add-on service on top of LOCKSS or Portico), but the Big Five definitely do not want to do that, because they sell bulk access services at lofty prices.
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:
https://archive.org/details/arxiv-bulk