IPFS archives is the effort that's going on right now to archive sites. Eventually there will be a system for automatically scraping & re-publishing content on IPFS.
Right now storage space and inefficiencies in the reference IPFS implementation are the biggest problems I've hit. Downloading sites is easy enough with grab-site, but my 24TB storage server is getting pretty full :( ... Gotta get more disks.
Say you grab a site. How do you announce that fact, verify that it is an unmodified copy, sync/merge/update copies and deduplicate assets between different snapshots?