You're absolutely right. And that's exactly why there is no Trek on TV right now and why there probably won't be for a very long time.
Trek used to be popular and make money, and then it got less popular with each subsequent TV series. It is no longer worth the investment to make more Trek shows.
The ratings of TNG were much higher than TOS or any of the other shows, which is why it survived 7 seasons, and it was arguably the most philosophically and scientifically challenging trek incarnation ever. VOY and DS9 lasted 7 seasons as well. ENT lasted only 4 because it attempted to make it more accessible to the masses. The 2009 thing 'succeeded' financially because it was marketed to the masses as a generic summer blockbuster and nothing more. The star trek affiliation was in namesake only. It did not succeed as a star trek movie, but as an abstract object called a summer blockbuster. This is the very first time this can be said of a star trek film. Despite TWOK's success, it still succeeded as a star trek film.