"Three movies in seven years means only the most marketable stories will make it to screen... the lowest common denominator of story lines. " Then why does this issue not impact the Captain America films you cite?
Doesn't it?
I don't know because Captain America doesn't have nearly the history for me as Star Trek. I never read Captain America comics (or Iron Man, or the Avengers) growing up, so I have no reference. I did read Spider-Man, Batman, and some Superman, and those film series have been as hit and miss as the Trek film series.
Nolan did an amazing job with Batman for three films, but at the time it was a franchise the studio had all but abandon.
Batman Begins had two sequels because the studio had low expectations to begin with, but
Superman Returns did almost the same at the box office and was shelved again for not meeting expectations. So yeah, good films
can happen when studios let them be made.
Again, I don't know about Captain America because I don't know if better stories exist somewhere else. I know that his first three films (two in 1979, one in 1990) were awful, so the character is batting .500 (if we don't count the Avengers films).
I know that the DC's television universe revolving around Arrow is significantly better than DC's cinematic universe so far. So yeah, as a general trend (rather than the black-n-white, concrete statement you were attempting to read it as) I'd say it holds up pretty well.
It is possible to make a good quality film series, but the deck is stacked against it, specially if the studios have high expectations. The MCU was started with B/C list heros from Marvel... I had read comic books for years and knew nothing about Iron Man or Thor, and (as I said) Captain America had three previous films that were awful. The fact that
Captain America: The First Avenger was a good film was pleasant surprise.
The other way of looking at it is that films should only be made when you have a compelling story to tell. I loved
The Incredibles, but Bird has said that there isn't going to be a sequel until he has a story worth telling. Maybe Star Trek, Star Wars, Jason Bourne, Jack Ryan, Marvel and DC should operate that way... if you don't have a compelling story, hold off on making a film.
Honestly, I don't hold out much hope for Star Trek as a TV series today either. Most series are based on season long story arcs which goes against good stories slipping in. Not a black-n-white statement (any more than the quoted one above), so please don't read it that way.