The Cure...
A cure for vampirism goes back to the old original "Dark Shadows" in which Dr. Hoffman tried to cure Barnabas Collins using a series of injections.
The truth of it all is that there is no cure for vampirism. A vampire is a re-animated corpse that feeds on blood, the life force, to remain "alive".
Yes I accepted the "DS" plot line because well the actors were so darn good. Not the same class here. Come to this of it, "Buffy" once toyed with curing a vampire. Magic I believe. But what happened? The vamp had been a prostitute before "becoming" and once human began dying from an STD they got 500 years ago that had been dormant but still potent!
That this show pulled this out of the writers room seasons ago and now is making it again a key plot point to this season drives me a bit nuts. A cured vampire is a dead person.
I dunno what to think anymore... I am watching because I started with the show in the beginning. But as someone else pointed out, the show peaked around season four or so.