I've seen three different posters at my local cinema with the different dates. Likewise posters on the aide of buses and bus stops. So money definitely had to have been spent on marketing to a point. People saying "eh, it wouldn't be much" are kidding themselves. If it had come out when it was supposed to? Yes. It likely would have got away with 20 - 25m on advertising. But not with those delays.
Well, his vampirism has fluctuated in the comics: one minute he is cured, the next he has found a way to live with it, others it's been amplified. They really need him to cross paths with Spidey because his radioactive blood has both starved off and/or stabilised his bloodlust.I'd personally be fine with seeing Morbius in another ensemble movie but not a solo movie, I don't know about the character's comic lore but after his movie introduction I don't see what else they could do just with him. A review I read pointed out how, about his anti-hero inner conflict, a connected guy who dedicated his whole life to save others shouldn't have a problem getting voluntary blood donations, even if his vampirism turned out to be as incurable as Fantastic Four Thing is in comics.
His rogues gallery isn't extensive either. I mean, he has Simon Shroud, Vic Slaughter, Basilisk and Bloodthirst. He has also crossed paths with John Jameson as Man-wolf as well.
They could probably do Vic Slaughter next go around or maybe Sony does a Man-Wolf film and cross them over. But, outside of Spidey, the bulk of Morbius story requires the other supernatural characters from the MCU.