If no one else does, Google will archive al of this stuff and with storage getting cheaper and cheaper, most websites will be stored in multiple places, accessed years later and stored even more times. Whether they can link the stuff back to you personally is iffy, but the sentiments will be there.
Great post, Nick, and I enjoy your Twitters wholeheartedly. Never take advice from someone who uses phrases like "personal brand". We're not brands, we're humans, and in our real lives, we like to have fun.