I can't see why this needed a whole thread to itself but I don't have a problem with the idea as a means of fixing at least one broken aspect of the PT.
I know there are a lot of people who with some justification argue that you should just watch the films in the order they were made.
But the the episodes have been numbered since the re-issue of ANH which turned the one off film Star Wars. into a middle episode of a saga spanning episodes which go backward as well as forwards.
In this sense the PT should not have been made as prequels as such but as earlier episodes. It should be possible to enjoy them as prequels and as the first episodes of the over all saga.
The surprise of ESB should have been maintained in the PT. We old timers would enjoy the irony of knowing how the story would play out but the new generation of fans would enjoy the series in a different way. Chronologically.
What we know of Vader is that he was a pupil of Obi-Wan's before he turned to evil and helped the Empire hunt down and destroy the Jedi. We later learn that Anakin was a good friend. Obi-Wan was convinced that he could train this great pilot as well as Yoda (the Jedi Master who instructed him) and failed.
In the PT as it stands, Obi-Wan meets Anakin when he isn't yet a knight, his master isn't Yoda and Anakin hasn't shown any piloting skills beyond pod-racing.
He spends most of the final battle on auto-pilot and blows up the command ship by accident.
Obi-Wan is only knighted because his Master argues he is ready so he can move on to train Anakin who he has discovered.
Obi-Wan insists on training Anakin after Qui-Gon dies. Yoda reluctantly goes along with this. Obi-Wan does as good a job as Yoda who also had a student who turned to the dark side and joined the Sith.
In every possible way the PT fails to show us the story revealed to us in the OT while simultaneously wrecking the surprises of the OT.
You fix this by having Obi-Wan a fully fledged knight in TPM, trained by Yoda (who isn't Dooku's master). He is on a mission with Qui-Gon (a senior Knight but not his Master) when the team meet Anakin Obi-Wan demands to train Anakin but is denied this because he has a pupil already. Qui-Gon could argue that Obi-Wan's pupil is ready to face the trials and he gets to train Anakin.
Anakin is hardly ever called Skywalker in the PT (all instances could be easily removed) and it's only revealed that Luke's father is called Anakin in ROTJ so introducing another pupil creates ambiguity.
That ambiguity gives an editor room to manuever, to turn useless characters like Grievous and Maul into potential masks to hide the reveal in ESB and create a single ongoing threat to the Jedi, rather than all the fragmented action figure opportunities we have in the PT as it currently stands.
Anakin could be Vader, the other pupil could be Luke's father. Either could be the tattooed guy or the cyborg Jedi killer. If it's handled carefully it could work in a PT edit so asking for the idea to die is pretty stupid.
I can understand an idea not appealing to an individual but surely ideas should be kept alive and tweaked and tested. It's not like the PT is a classic series of films where alterations might break or deform them. Frink has proved even the most ridiculous changes serve to make the films more watchable.