2. A Non-Human Captain Would Break New Ground For The Series...
The Captain is traditionally the central role in all Star Trek series and films. As a result, storylines tend to be launched from his/her personal perspective and their parent culture and backstory are more fully explored than those of the other characters. Star Trek is always looking to be different and to break new ground, so what could be more unusual than an alien protagonist in the Captains chair? His outsider viewpoint, amplified by the loneliness of command, would enhance the Humanity of the other cast members and, whilst this has been done before with characters such as Spock and Data, it has never been done with the series lead protagonist.