That's the neat part Palpatine didn't have a planned line of succesion. If he died the empire died and he would soon return to life to create it again.

Exactly. In Canon, Mas Amedda stepped in to take over after the Emperor's death.

In Legends, it was more of Palpatine not planning for it, which we know has happened throughout history. It's rare that anyone can fill the Emperor's shoes.

In Canon, it was 'the empire dies with me, so it'll be stronger when it's rebuilt by those that resurrect me'.

Vintage, bottled stupidity.

^ Yup. Almost as stupid as the Rule of Two. Sith line dies out in hyperspace accident. The end.