Yes, I've had this thought: that this is the beginning of the "high density" version of recorded history.
That, barring a cataclysmic implosion of civilization, the internet archives being populated now will likely be available for perusal 10,000 years from now.
As a corollary thought, an interesting exercise might be to only generate content -- movies, essays, fiction, non-fiction, whatever -- that you think people 10,000 years from now will find interesting. How does this constrain what projects to undertake?
One way to make things that will be interesting in the future is to make things that are interesting now and would have been interesting in the past. If you can span a few thousand years back in time, there's a good chance you have something fairly universal.
This is another reason to study history: so you can imagine what people a thousand years ago would have liked.
Or as a variation on the Turing Test, create a program that reviews all of your published material, then continues to comment and participate in discussions long after you are gone based on the material you consumed and the comments you made while you were alive -- in effect, transforming you into some sort of virtual living dead.
Somehow I feel compelled to add an evil laugh at this point.