Peter may be dead..but Spider-Man still lives on. I don't see the reason to stop reading just cause Peter is dead.....that's kinda silly.
Me personally I've always wondered what it would be like if Spider-Man died heroically, and how the world would react without Peter Parker and if someone would be his successor.
This obviously would never work in the mainstream 616 universe. But the Ultimate Universe is where it's possible and Bendis is a brilliant writer. I'm really enjoying where the story is going and Miles seems like a great successor for Peter so far, worthy of donning the mantle of Spider-Man. It will be interesting to see how things go for him with past Spidey villains, interacting with those who knew Peter, and what new characters will be introduced.