Doesnt make much sense... First of all, he also said "Once more the Sith will ruuuuule the galaxy"
Secondly, doesnt make much sense to imbred the clones with such order "if i die, all the clones should die with me". Its like saying "If I die, i dont want the bad guys to keep ruling anymore, just leave the galaxy to the good guys" Im guessing even if he dies he prefers the galaxy to be ruled by a Sith than by a good guy.

It would make much more sense a rule like "If I die, i want all the clones to start killing EVERYTHING in their sight"

If you want to feel like the death of the Emperor is much more important, just tweak all the "celebration" scenes to "riot" scenes. Killing the emperor and the death star is just a symbol for all the people to rise against the Empire. You dont even need to show if those riots end up well, you just imagine they will even if there is much more fighting to do.