Each and every Star Trek series looks a lot lot different.
Deep Space Nine theoretically takes place at the same time as The Next Generation and the TNG movies, yet looks and feels nothing like it. I don't care if Discovery looks like TOS, if they get the level of technology right. And that's very broad. They can pretty much do whatever they want, only grossly incompetent stuff like them doing hyper-jumps or beaming between different star systems would breake the illusion... but nobody would make something that stupid, right...?
Enterprise already looked a lot more advanced than TOS, but (IMO) firmly established itself as a proper prequel, especially during it's last seasons. And Fuller probably as a much tighter vision, and as people who have watched "Hannibal" told me he's quite capable of doing a "direct prequel to something popular", so I trust him in this regard. The setting will not be the problem of Discovery, everything depends on the quality of the stories and how All Access will do.
I haven't watched Hannibal, but its ratings at least didn't look good. It was cancelled after three seasons, overall only 39 episodes, after the ratings fell to below 1 million viewers. I surely hope DIS will be more successful than this!
When I also look at other shows, he created or developed, they didn't even last as long as Hannibal. After a few measly episodes they were cancelled.
https://en.wikipedia.org/wiki/Bryan_Fuller
Dead Like Me - 29 episodes (Fuller left though after 14 episodes already)
Wonderfalls - 13 episodes
Pushing Daisies - 22 episodes
So far he hasn't show yet, that he can make a series last.
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