It's wide to open to all sorts of interpretations though. No body to bury so who knows what might have happened in the last second? It's bond after all, the whole thing is full of outrageously improbable stuff.
The only thing we know for sure is that he can't have contact with his girlfriend or their daughter. Everything else is still to play for.
I think the black woman playing the 'new' 007 was a bit of a red herring, put there to make us think the next Bond will be both black and a woman but how can that be, when she isn't actually JB? After all, the whole book and film franchise is based on the man who is called James Bond, not on his agent number, which is transferable.
Some possibilities going forward:
James Bond actually married Madeleine, it just wasn't mentioned. She is Mrs Bond and becomes 007 herself.
Or the remaining unadapted/unused Ian Fleming material will be made into new Bond films but they will be prequels in the sense that they will go backwards in time to when JB was still alive. So this film is the final one in his life, but not the last story to be told, if that makes sense.