Discovery could become the best show ever created at this point and still wouldn't get most of us back. I will list reasons in order of importance to me personally:
1. They told us (existing Star Trek fans) that we would watch the show no matter what, so they didn't care if they followed any sort of canon.
2. They then senselessly changed canon, in extreme ways (physical appearance of Klingons, state of technology in the Federation, Klingon culture and unity).
3. They locked the series behind a failing paid service.
4. The first 5 episodes gave me no hope the series would be worth anything, failing to provide one likeable character, one interesting premise, or one original idea (space bear warp was even ripped off of a videogame).
5. All of the casting was terrible, with the only two good people in the show being murdered right away or the writers insert of the evil white man.
6. No waifu material at all.
7. No merchandizability. I like building ship models, and there is no way I am gluing a spinning saucer onto a pizza slice.
1-8. In the background of all of this, being told that if I don't like the show, it must be because I am a fat basement virgin, or because I am white, or anything that deflects from the fact that the show was not a true Star Trek series. It might possibly have been a decent sci-fi series if not branded as Trek, but I don't like my favorite series name being whored out and then being told I am an awful person for not liking it.
I truly feel like Star Trek Discovery is like your sister that you love, who then starts trying to fuck everyone she meets, in front of you, while begging you to watch her get shit and pissed on, and then yelling at you because you want to turn away.
Fuck CBS. At this point I actually need them to destroy Star Trek bad enough they will sell the IP to someone else that will give it the love it deserves.
At least in the meantime I have Orville for the trekkiness it feels like and The Expanse.