When we will have the technology to replace all the original voices with artificially created voices that sound exactly like those of the original actors (and thus basically redoubing all the dialogue), then I would like to bring these radical changes to the plot of the Trilogy:

Making attachment partially accepted by the Jedi, thus turning Anakin and Padmé’s relationship into something public, of which everyone is aware.
Changing the reasons behind Anakin’s fall to the Dark Side.
During the fight on Mustafar, let Obi-Wan try to bring Anakin back.
Making the dialogue more consistent with the Original Trilogy (Anakin wanting to give is son his lightsaber, etc).