There have been female spies, one with the designation of 007 doesn't bother me, per-se. However, I anticipate that the "hook" isn't likely to be a good spy story, it will be some kind of punitive message for fans of the franchise.
It likely comes from a conversation that went something like this...
"Idea for the next Bond movie! Imagine if we emasculate James Bond by having a woman take over the nomenclature 007. We'll have a scene where James Bond hits on her and she just rolls her eyes at him. Oh, and we'll make her black. Let's find a "stunning", but not overtly sexy black actor to play her. We'll include some dialogue about the patriarchy and Britain's colonialism. Let's get someone on that script, stat!"
But I could be wrong, maybe it's going to be a great story.