Ultimately, for any socio/ethnic group to seek representation in a fictive enterprise like Star Trek is self-serving.
The current main cast demographic is determined by history and marketability.
Kirk isn't a woman. Spock isn't a Horta.
To assume that the fundamental chemistry among the main characters should be changed to serve a politically aware agenda is as unrealistic as assuming that there'd be a direct transfer of TOS Enterprise - unchanged- into the alternate timeline.
The current main cast demographic is determined by history and marketability.
Kirk isn't a woman. Spock isn't a Horta.
To assume that the fundamental chemistry among the main characters should be changed to serve a politically aware agenda is as unrealistic as assuming that there'd be a direct transfer of TOS Enterprise - unchanged- into the alternate timeline.