Jeremy was pretty cute, I would've like to see more of him. He seems a little older than David, but he may just be taller and more filled out which makes him look more mature. He has a really different look from David, he doesnt really seem right for that part.
If Chris wasn't coming back I'd have killed Chris off and introduced "Jeremy" as Quentin's son who inherited the werewolf curse after Chris's death.
Getting off topic even further, I also always wondered what would have been done with Kate Jackson if the show had done another modern day storyline. Most likely she'd have been a modern day descendent of Daphne ( a great niece or something) who'd be the new governess. Of course, David and Hallie were really too old to have a governess anyways so maybe it was time for Collinwood to be without a governess and a new role would need to have been found for her. She could have been "Jeremy" 's sister, but then that would rule her out as a love intrest for Quentin.