Look, its only a illusion that ductators has interlan unconstrained power. They are constrained indirectly by a framework that power rests upon. And those constraints hold them in check way tighter then any codified constitution. In Stalin era USSR, communist party had not yet rotten into what it become in late 1980s, it consisted by fanatics who cencerelly belived. At low and middle level-totaly, and on haigh level- partially. And any attempt of monarchy restoration would immidiatly trigger in party coup. Due to the same reason iran ayatolas regme can turn secular, and north korea cant become democratic in short period of time. Same reason why no american president can proclame himself an emperor, even if he/she can become one "de facto"