Re: Would You Watch a Trek Series with an all male, all human main cas
All human is fine. And it makes sense; atmosphere, gravity, lighting, everything has to be optimized for one species or another. The vast majority of starships must be crewed predominantly by a single species. Indeed, probably by members of a single species, from a single linguistic background (no matter how good the Universal Translator is).
All male is not, although I'd be fine with all female.
Alternatively, how about no humans? We could have an all-Trill, all-female cast!
Seriously, I like the relationship possibilities of a mixed gender cast. You don't get anything like that by relying on guest stars.
One issue that people tend to ignore, but which is very relevant, is the fact that different species (not the same as "races," remember... there are multiple races of humans on Earth, but we're all part of the human species!) are inevitably going to be incompatible in many ways.
Different atmospheric requirements, for instance. We saw TNG try to address this by having the Benzites having little "gas emmitters" under their noses... but that was actually pretty lame, IMHO. It makes far more sense to create an environment which is comfortable for your entire crew, doesn't it?
Different thermal requirements. Yes, in TOS, we know that Spock found the Enterprise to be chilly, keeping his own quarters much more like a sauna by our perspective. But I'm sure that on the Intrepid, it would have been much hotter and dryer throughout the ship... and the Vulcans onboard would have been much more comfortable.
Different biochemistry. Most of you'll just think of food in that case. Okay, you can argue about "food replicators" making that largely moot, but even then, you're still talking about having stored replicator patterns for every race present, or potentially present. And that's not just a matter of taste ("gagh" or whatever), it's also a matter of biochemistry. Remember, we're not talking RACES, we're talking SPECIES. What might be delicious to you or I might be deadly poison to someone else, and even SMELLING it might make them quite ill. Suppose that some element of coffee... could be the caffeine, could be something else... will cause near-instant death to some members of the crew. Would you allow the crew to have access to coffee? Suppose that for another species, Sarin nerve gas is a favorite perfume. Would you allow that on board?
Now... medical matters. Granted, a computer may store sufficient medical information for everyone, but in the Trek world, medical matters are dealt with by doctors, not computers. McCoy knew human physiology quite well, but early on in the series he made it clear that he wasn't totally familiar with Vulcan biology. Eventually, they got a Vulcan specialist on-board (M'Benga) to compensate for that. This matter is just made all the more serious with every new species you introduce into the mix. And of course there's more than just information, there's also the need for specialized tools, medicines, treatment facilities, etc.
How about language? Yes, we were told that every Trek communicator in TNG had a universal translator installed... hence why we thought everyone spoke English. But isn't that a little silly? Doesn't it make more sense to have the crew able to communicate with each other, without difficulties, without the use of a technology (which may very well fail at some point)? And "have everyone learn English" isn't really a good answer to the question, is it?
What about more subtle environmental issues? Say, lighting. One race might have vision which is more sensitive in one range, and another might be more sensitive to another range.
Humans tend not to react well to blue lighting, for instance. Blue lights make for good indicators, but not for actual ambient or direct illumination. (And before you start saying "but the sky is blue," realize that it looks blue because the blue light is scattered by the atmosphere while the other wavelengths make it to the surface unscattered... so if anything, we see the blue sky but have less blue in the actual visible spectrum of sunlight.)
What if another race is most sensitive with blue light, and yellow light (which we tend to prefer) makes them ill, like blue does with us? Would you put both species on the same ship and make both wear goggles in order to avoid throwing up all over each other?
And, of course, you then get into cultural issues. Trek played with that on occasion, but only in very simple ways. The different cultures were really different HUMAN cultures. None of them were ever particularly alien. And as a rule, the other "alien" cultures (Klingons, Romulans, Ferengi, etc, etc) were portrayed as being "less enlightened" than the SoCal culture the series portrayed as being the "good" culture.
Imagine, however, a totally different culture. Perhaps, for instance, one where a female gives birth to a litter of pups once a year, and eats all of them alive except for the strongest one. And these were sentient creatures, albeit infant sentient creatures, remember.
Could we accept that?
SO...
The idea of "mixing cultures" sure sounds great, but there are real, legitimate, logical reasons to minimize the mixing of cultures if we ever face this sort of situation in reality. It's not "discriminatory." In fact, the idea that all of these cultures would have to change and conform to OUR morality and live in an environment comfortable for us (and have to wear a "Benzite Breather") is actually far more discriminatory, I think.