It’s certainly an interesting project, and addresses an important concern (link rot). But the security implications of archiving arbitrary sites/js and then running that on your own domain are rather horrifying to me (especially if this would be used for any user supplied links).
Personally, I’d rather have a service that automatically submits any external links to an existing archiver (archive.org) and then falls back to that source when the original 404s, rather than serving those pages/videos locally.
I see no real benefits in this proposal and an increased attack surface for the supply chain.
I’d also disagree that Django’s developmental pace is slow. Granted, I only came onboard with version 2, maybe older versions were slower. After years of dealing with JS churn, I appreciate Django’s pace (actually, I think they could even slow down the major version increments).