if Heydrich had survive
he had "passified" the Czech by mass murder
Hitler had idea to promotion him to goveneur of Belgium, Netherlands, Luxenburg.
(Hitler saw Heyrich even as future "Fuhrer des Reichs")
Heydrich had expane his wishes to Himmler wat to do with Benelux (some time befor his death.)
"Germaniersierung" of benelux and intergation in Third Reich.
Heydrich was nicknamed HHH (Heinrich Himmler Hirn = Himmler Brain) in SS
Heydrich and Himmler had an odd but practical working relationship. Although Himmler was the boss, Heydrich was the true force behind the SD. The two men were vastly different personalities but they were united by their desire to succeed. Heydrich was everything that Himmler wished to be: tall, blonde, blue-eyed, cold, calculating, and intelligent. Himmler suppressed his jealousy because Heydrich was helping him to achieve power. By the same token, Heydrich blindly obeyed Himmler despite the fact that he considered him to be a fool. He knew that Himmler was his ticket to power. Thus the two men formed a solid partnership and became a dangerous duo.
source wiki
but the most important on Heydrich survive is the Holocaust !
he had the idea of "the Final Solution" SS inter called "
Aktion Reinhard" or "
Einsatz Reinhard "
he would have remain head of this "Operation"
in OTL after Heydrich death, Adolf Eichmann a SS "bureaucrat" becomes head of "
Aktion Reinhard"
who have be the holocaust under a leader how is called by college:
"a cold, calculating, and intelligent blonde beast" ?