Re: could they do a show with "realistic" aliens?
A dolphin, no matter how intelligent it will become in the next couple of millions of years, will never, ever, build a house, a computer or a spaceship. NEVER.
Which is not necessarily a bad thing because he will also not invent weapons of mass destruction, pollute his environment and enslave others to work for him.
Which reminds me of the Gorn species. Unless they somehow utilize slave labor it must take them decades to even assemble a spaceship.
"The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! Jean-Luc Picard