I wonder whether the Bond/M relationship will become less conflict laden from this point onwards.
With the casting of Dench it was a mandate to give her something to do - which led to more involvement between her and Bond, and turning it up even more in the Craig era. With her being killed off in SKYFALL it would have been possible to go back to less personal relationship only if not another A-lister had been cast as M.
After the Craig tenure, it would have to become a total reboot in order to get back to the 60/70/80-relationship. Otherwise critics will ask: hey, now M is just a Mr. Exposition again, what a waste! And Fiennes would say: I’m not playing that.
As for OHMSS - I think back then I would have been quite irritated by the way LazenbyBond suddenly had all the experiences of ConneryBond. In that regard it was not like a reboot at all, it was just shoving the new actor into this universe and acting as if he had been there all along. This is what LALD, TLD, GE and CR thankfully avoided - although they all had parts of the previous cast return. But at that point we were used to the rebuilding of Bond´s world with former parts. OHMSS had to start it, and EON had the good fortune of one of the best Bond stories as a basic element. Just like CR.
For the time after Craig this will be the next film´s biggest challenge. Especially with so many Bond films now already having mined the existing Fleming novels. What would new ideas for Bond be about? Are there new ideas for it? Maybe only if the next arc/tenure will be placed in the changed contemporary reality. One in which the virus is still rampant or overcome. One in which Great Britain has completely changed, with Bond having to fight for someone he does not believe in anymore, yet trying to bring balance to world peace by sticking to his job?