Making Bond black, or a woman, or ugly, or blonde, or whatever deviation from the source material people are liable to get angsty about at any given moment in time, isn't simply just "for the sake of it"... it's a crucial evolutionary aspect of literally every long running franchise, or regularly adapted story, that helps them last longer, and stay relevant, rather than die.
For example, when was the last time you saw a mainstream adaptation of Romeo and Juliet set in Verona, and starring italian teenagers? Or indeed any major Shakespeare adaptation that adhered remotely faithful to the text, casting or setting wise? - that wasn't also promoted as a novelty for doing so? Chances are it's not recently, just as the chances of seeing a gender or race swapped version court any kind of controversy these days would be similarly low. And that's 'cos the biggest singular reason Shakespeare has endured as our greatest literary icon, is precisely due to his works having been regularly and continuously changed and re-imagined to appeal to almost any and every part of society over the years.
This is how cultural media works!... There is literally no point in making the same film 25 times, just as theres no reason to keep adapting a book or a play in the same way over decades, or centuries! ... Now, I'm not saying we need to leap straight from a white man to a black woman, but rather that if do eventually we get there (via the slow, accepting passage of tolerance for - say - a black man, then a gay man, then a white woman, etc etc) then great! Because all that will demonstrate is how enduring and relevant the Bond Franchise can be... Which it absolutely wouldn't do, if it had insisted on casting Connery clones, in tonally identical movies for 50 years!
Just look at Joker! A film that would've usually been slaughtered by the rabid comic book fanbase for deviating so drastically from it's source material that it didn't even include Batman! And yet which has bizarrely been championed as high art, merely because it's message pandered to the very same type of culturally frustrated white males that would usually complain the most about changing established lore, or altering straight white cultural icons. But which has thrived precisely by being an odd ball left-field re-imagining of a Batman villain, way more drastic than changing his race or gender would've been... say, in the way,Tim Burton did when he made Harvey Dent black in 1990, for example? (and which absolutely no one cares about!)