I'm surprised there are no virtual cemetaries. A company (a known Internet entity like Archive.org, WikiMedia or W3C would be best, not a startup that will pivot away in 3 years) could offer for a fixed fee to take your blog, freeze it in time, and publish it online forever.
There are several obituary sites, they're one step away from that. And in a sense portions of http://reocities.com/ are exactly that, for instance: http://reocities.com/SunsetStrip/1838/ I'm committed to keeping that alive as long as I can afford it. So far so good.