Oh, and the reason that they were discontinued had nothing to do with the shaky foundation and everything to do with Paramount's mismanagement.
Paramount is absolutely blameless. They let J.J. Abrams do whatever he wanted. He delivered ST09, which was a win for everybody involved. And then he gave them a choice, to either
A) Let the sequel be directed by another director, or
B) wait 4 years until J.J. Abrams has finished his personal film
They did the latter. There was no convincing Abrams to immediately return - this guy just got his break in Hollywood, but also wanted to be known as an "auteur", instead of solely "franchise director", so he insisted on doing a smaller, more personal film inbetween every big blockbuster. He did this until Star Wars. Like his role model Nolan did. And is honestly a good personal choice for a director.
Paramount did the absolute right thing, and waited for him. (Look at how other sequels with a different director turn out - Pacific Rim 2 anybody?).
It wasn't their fault Abrams & Co. so utterly dropped the ball on "Into Darkness" (Treks "TLJ"-movie - not being bad, good reviews, but pissing of a huge chunk of the core fanbase). And was absolutely not worth the wait. After that there was no coming back from that for the sequel. Yes, the marketing for "Beyond" wasn't that great. But to be fair - Paramount did a shitload of marketing. It was just...bland. And people didn't remember it. But that was because, quite honestly, the movie itself was pretty bland. It's good. But there was never a way to sell that movie as an exciting blockbuster for mainstream crowds. Because...it just isn't.