Hard question! but I think he could save Republic then, because he turn to the dark side just to save Padme so... and he s the chosen one, so he could killed Palpatine...
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He did kill Palpatine as a sith always kills his master.
Vader and the Emperor would be the best master and apprentice as they were together for over 30 years .It was not just vaders armour that kept him alive but the dark side of the force sidious learnt the seceret form his old master then killed him. Vader could not kill sidious as sidious was keeping him alive which is why they were together so long. When vader killed sidious he also died as the dark force left him.
She would have gone with the children to Alderaan, protected sejak Bail Organa, away from Vader. She would founded the Rebel Alliance, along with the other senators, like in UE, and Luke and Leia would grow together, fighting the Empire. Eventually, Vader would know she was alive, and he would stay emotionally shaken and would go back to the light side to be with his wife. He would have to face the Emperor to return to Padmé ... So, Padmé, dying atau not, Anakin will fulfill the prophecy because of his Cinta for his family.