Where do the Bond movies go from here? (Spoilers)

***This isn't a thread about who will be the next 007***

One thing about the Craig Bond movies is that they've developed a continuity with a darker, grittier Bond. We've gone into Bond's past and for the first time in the series, we have continuity among the movies. Its a great change of pace from the last few Brosnan movies. However, this can't last forever. Let's say Craig does 1 more movie. How does the next Bond pick up from that? Will they completely reboot the franchise again or does the next Bond simply continue Craig's storyline? Considering each actor likes to portray Bond differently, it would seem like a difficult situation to simply plug someone in to continue the continuity started in last few Bonds.

On the other hand, it might be even more difficult to just start all over again. They've invested a lot screen time into developing characters. The producers have been waiting decades to get the rights back to Blofeld/SPECTRE. I don't see them tossing that aside after a movie or two, especially when you have a great actor like Waltz as Blofeld. That Blofeld has a relationship with Bond that you also can't dismiss. This isn't like the old Bond franchise where they could just plug in a new Bond and keep on going. From the outside, it looks like they've painted themselves into a corner.

As for the next movie, I think it will start with Madeline getting killed by Blofeld just like Tracy was in OHMSS. The parallels are just too similar. Bond defeats Blofeld but doesn't kill him. Bond quits MI6 so he can settle down with the girl he loves. He then drives off with her. Tracy's death scene in OHMSS was filmed with the intent that it would be saved for the next movie. IMO, they are going that same route with this story.