In 1000 years Adolf Hitler will be remembered as...

[Middle-aged Europe]

Depends... as I understand it, Hitler evokes a relatively positive image in India up to this day. This is also the case in some other parts of the world. So what happens if India becomes the world's sole superpower by the end of the 21st century?

Maybe in the 31st century Adolf Hitler (then pronounced "Eydolph Hytler") is primarly seen as the driving force in bringing down the remaining Western colonial empires and the racial and political opression it entailed. The fact that he was the worst of all racists himself perhaps ends up as a mere political footnote (he was ultimately unsuccessful in his racism after all) in the same mold as George Washington's slaveholder status or the fact that FDR put Japanese-Americans in internment camps.