100 episodes isn't taking a chance. It's making a major financial commitment. There's no way a Hollywood studio is going to back what is, quite honestly, total insanity.
A single episode might be produced, for dirt cheap (similar to "The Lost Tales"), as a way of testing the waters, but probably not with a property like STAR TREK (which Paramount wants to keep a major motion picture property for as long as possible).
CBS/Paramount would have to commit somewhere in the neighborhood of $275 - $325 million dollars to get to one hundred episodes. Assuming that it's not done "on the cheap". At $3 an episode, each episode would have to be downloaded a million times in order for it to just break even.
Animation on a cable network is probably the only way Star Trek
returns to TV for the forseeable future.