A discussion on FB about switching races of characters led me to use the G.I.Joe movies as examples, pretty extensively.
The first movie is full of race-switching for no reason whatsoever. Breaker and Ripcord are the two big examples. Also, not quite race, but Baroness is American. The movie failed on all levels. (Ripcord's problems with being like any previous version of Ripcord were so bad that the race change was the smallest of them.)
But the second movie is especially interesting. We have Dwayne Johnson, who is so light-skinned most people seem to think he's white, playing the best-known black dude from G.I.Joe. (Seeming) race-switching based more on casting the best actor for the role than simply to make things more diverse. And, in the same movie, we have Blind Master as a black dude, presumably because the comic book Blind Master was black, never mind that the black guy they cast sucks ass in the role and there's no logical reason or explanation for why the leader of the "good" Arashikage in Japan is an American black man. It's almost like they set out to prove that casting a character based entirely on race (when it's not a case where the race is an important facet of the character--you can't have a white Luke Cage or an South African Storm Shadow) fails.
Another point was, if you're going to stick with the races as originally created, anything before the 1980s is going to be an awful lot of white guys. And the minorities are going to be caricatures. Again, I went to Joe as an example since it's from the 80s and has a billion characters. It's not until the fourth wave that the minorities weren't stereotypes (with Zap being sort of an exception, since his filecard says practically nothing about him, the figure looks like Grunt with black hair, and he was underused in the comic and cartoon, so most people probably think he's white if they even remember him). Stalker: street gang leader from Detroit. Roadblock: so scary that he doesn't need his guns. Airborne: likely psychic. Spirit: talks to animals and dresses like a Village People reject. Storm Shadow: ninja. Wave 4, you get Quick Kick (a stereotype, but more a Bruce Lee homage than a straight-up stereotype), Alpine (about as white as a black guy can get), and Shipwreck (who is so non-Mexican that the cartoon just made him white for all intents and purposes). It's almost like a backlash against the earlier guys. And then from that point they get normal.
*--For behavior unbecoming anyone, perpetrated in real time over an extended--AH, FUCK IT! MORE MALIBU, BITCHES!!