If the webmaster forget to renew how exactly do you think a permanent link pointing to the dead website might help? It's up to webmasters to enforce consistent

If the webmaster forget to renew how exactly do you think a permanent link pointing to the dead website might help? It's up to webmasters to enforce consistent permalink in their website, no one else can do it better, end of story. Web archive will be of great historical value for futur researchers, but backward compatibility of any service or software rely on developers, not a third party.