To address the comparison that you (and I'm sure sure countless others) are proposing, I just want to point out a key distinction between this potential ANH retcon and the one that Lucas did with the
"...from a certain point of view" patch.
When the first
Star Wars came out, there wasn't really a luxury for leaving Luke with glaringly unfinished business. Sequels were arguably a longshot. The ESB plot twist provided a more profound personal arc for the main character, thus justifying the retcon as essential to drive the narrative forward. Its purpose was to give the saga richer thematic underpinnings. But what you have now, in contrast, is a *fully-realized* story and character arcs being tinkered with for every extra dollar that can be squeezed out of those iconic characters and the less relevant gaps in their stories.
So, the better comparison, IMO, is when Lucas literally changed the dialogue between Vader and the Emperor in one of the "special" editions of ESB so as to better line up with his poorly-thought-out Anakin origin from the prequels. I prefer if the originals had been considered off-limits masterpieces, free of any future tweaking. But still... Lucas doing it is one thing; it's his creation. Having it done now is a different level of objectionable.
Retconning key context from the original Star Wars movie to shamelessly pander to those wanting the "coolness" of another duel between Ewan's Kenobi and Hayden's Vader is something that I can only shake my head at, rather than try to justify it. And then some lame explanation for why Vader would identify himself as "a learner" 10 years after Mustafar will follow. It will be so much laughably stupider than anything the Kenobi character uttered on Dagobah in ROTJ. The context of not only Vader's ANH dialogue, but also Tarkin's, should be beyond any attempt to provide new context now.
Even if this shamelessly pandering duel is used to patch up incongruity with the PT, I still wouldn't see that as reason enough to diminish a key scene in ANH. It's like being disgruntled that your exterior walls have crap stains which you can't remove, so in an effort to make things seem more unified, you smear crap on the impeccable interior walls. I'd rather just do my best to ignore (or, preferably, paint over) the unsightly walls while preserving the excellent ones.
But yes, fun discussions to eventually be had.