I did not for several reasons.
1. The Greybeards have helped me from whiterun, Ive known the blades like 5 days and they expect me to kill the leader of the people who accepted me into there circle like a son, no way!
2. Paarthurnax helped me with every aspect of defeating Alduin, all the blades did was show me a wall, he told me what shout, how to learn the shout and how to get to the people who could teach me such shout.
3. He has suppressed his nature for 1000 years, if he was going to go and enslave mortals why would he not have done so? There was no dragon born for centuries so he had ample chance yet his mission for dragons is to enlighten them with the "Way of the Voice" which is a peaceful doctrine.
4. My character has become champion for most daedric lords so far, ranging from nocturnal to molag bal, by the time I die my soul is going to be fought over so much im betting I could resurrect before anything bad did happen. Espically since dragonborn seems to be the best mortal servant any daedric lord could have so im hoping they will give me longivity in exchange for something. If not then hell ive got dark brotherhood, thieves guild, college of winterhold and High king Ulfric in my pocket, If im dieing then I can give lessons on how best to kill dragons and teach every able bodied man/woman dragonrend to avert disaster.