http://starwarsawakening.wordpress.com/
This guy is doing exactly that, writing a reimagining of the PT. It is fully intentioned to proceed the OT, in the same way the PT did, but telling a completely different story.
As for the superhero films, perhaps Batman and Spiderman are bad examples (though not as bad as your thinking the earth is flat example, IMO :P), but the comparison to Superman is not a bad example.
Superman 1 and 2 both had a certain feel. People enjoyed them for what they were (though the Donner cut of 2 is often regarded as the better version).
Then came Superman 3 and 4, which are widely viewed negatively in comparison to the original films, and led to 20 years without a new Superman film.
Following that 20 years, they were trying to figure out what to do with Superman in this endless stream of superhero movies. Rather than start over, they decided to COMPLETELY IGNORE films 3 and 4, and make a new direct sequel to Superman 2 called Superman Returns. For many people, it became as if Superman 3 and 4 had never happened.
Such is the case with the PT. Even though we may not have another film re-imagining to replace the story prior to the OT, many people have their own personal ideas of how it COULD have happened that they enjoy far more than what we actually got.
When it comes to the OT, I never watch my official ANH because in my personal Star Wars canon, Jabba never confronted Han Solo after he shot Greedo. As in, it surprises me any time I happen to catch it on TV or at a friends house. To me, it ISN'T a part of MY Star Wars, and for some people, the entire PT didn't happen in THEIR Star Wars. And that's okay.