Yes, the games industry, and mass media needs to expand their roster, by nationality, race, and gender. This is a thing that really does need to happen, as homogeneity and clichés need to be worked against in order to create stories of varied substance and worth, not just for the sake of diversity.
However, it should be noted that in the current media climate, the use of white male characters being 'safe' isn't just a matter of sales.
When a female protagonist is hurt or endangered, the media screams misogyny, or rape culture. When a black character is given a criminal history, the scream is racism. This doesn't just extend to main characters, mind you.
Remember in Deus Ex, when one of the early gameplay videos showed him meeting a homeless black woman in Detroit, and she talked like a crazy homeless person? That character was removed because people screamed racism.
So, imagine, when a bunch of creators are sitting in a room, bouncing ideas around. They know the media slog they're jumping into, because they've done it before. If their character is a woman, she better not be in too dangerous a situation, or act too provocative, or be too manly, or look too sexy, or not sexy enough. Any misstep will get the journalist outlets that will be the sole original source for information about their game haranguing them as monsters.
While I think more creators need to buck this trend; to create more varied characters from different backgrounds/races/what-have-you, it is pretty easy to understand why people marketing a product to sell would take the path with the least offensive complaint that can be levied against it.
"Your white male character is boring" does a lot less damage to sales than "Your female characters are misogynistic" or "Your ethnic characters are racist".
The best way to encourage companies and creators to expand their diversity in games and other media, is to promote media that shows these types of characters as people, warts and all. Until they see they can make a profit (and yes, in the end, it is about profit) off of breaking a mold that works, they won't.