I remember that series well; I watched it. Ben Cross & Joanna Going. It had much better production values than the original, but it failed in prime time.
I was one of the original DS fans, back in the '60s. Used to race home from school to see it around 3:30 or 4 in the afternoon. Part of its appeal was how unexpected it was in the TV landscape. Back then, everything in the afternoon was a game show or a soap opera (set invariably in hospitals or courtrooms, as they didn't show s-e-x on TV in those days).
Another thing that set Dark Shadows apart was that it invented the concept of the tormented vampire, the vampire who didn't want to be what he was. That was very, very original back then, but has become a cliche since. And the actor who played Barnabas, Jonathan Frid, was hired to be a traditional, scary vampire. He wasn't especially young or handsome. He really was kind of scary, but gradually, as the character developed, you began to feel for him. It really was a case of an evolving story line that gripped its audience. They struck gold, almost by accident, I think. And Frid, who was classically trained, was very, very good in that role.
If anybody can make it work in a movie, I'd think it might be Johnny Depp. But I don't know if anyone can ever catch that lightening in a bottle again.