I can see only one reason. You love at least one of the previous Star Trek and don't like the direction of the new Star Trek show. You want it to fail because you fear the "new direction" will become the standard direction for Star Trek if it succeed too much.
The Orville or any new Sci-fi shows don't have an already established fan base and name recognition ($$).
Personally, I feel it's too soon to know if Discovery is too much a departure from the Star Trek I love (TOS, TNG, DS9 and Voyager).
Although, I'm on the opinion that there's no point in doing a Star Trek show if it's not Star Trek (that is, like TOS, TNG, DS9, Voyager and even Enterprise) in spirit (style, content, overall concept, etc). It would only be a marketing ploy to use the Star Trek name. For name recognition. Sure I like other shows than Star Trek like Stargate, Doctor Who, GoT, Spartacus, Rome, CSI, etc, but if people want to do another type of space action-adventure show, now matter how great it eventually becomes, they don't have to use the name Star Trek and change it for something completely different. They can start their own series. Torchwood was fine/great because it was actually a spin-off, not a new Doctor Who with a completely new style. Torchwood would have been an absurdity if it was the new updated style of Doctor Who.