Sure. But the way I see it, we will always have the unaltered Classic films... so the more he can do to make the existing six films work more seemlessly together, the better.
Look, I'm a purist too... but watching the duels in the PT and then watching the one at the end of ANH is just painful. There is just no way that is the same Obi-Wan.
And Lucas can't use the "Yeah, but he's old" excuse, either... 'cause look at Dooku and Palpatine flipping all over the place in the PT.
So, there are essentially TWO Star Wars sagas now. The unaltered Classic trilogy... and then the PT with the tweaked OT. And the latter still needs some work, no matter how much it might bother some folks.