They can swap out Bonds and update the plot as much as they want, as long as Jaws, Oddjob, and Dr. No are available in GoldenEye: 007's multiplayer I'm a happy camper.
Daniel Craig is my favorite James Bond, but GoldenEye was always about Pierce Brosnan, so I'm a little uneasy about the swap. The movies didn't just feature different actors in the same role; they were different Bonds appearing in movies tailored to their particular talents.
Only the inclusion of classic Bond villains assuages my unease. Especially Jaws. Back when I was a teenager, people used to tell me I looked like Jaws from Moonraker. That probably wasn't a compliment, but I took it as one anyway.