It doesn't have to be a thumbs up thumbs down situation. I mean, consider that TNG took three years to get its footing. It's not a death-sentence even if the show does starts out sucking. It all depends on the commitment of CBS to make it work.
I think the distribution method raises the stakes quite significantly. TNG was not the centrepiece of a subscription service. Discovery is.
If the first season flops, how many people will fork out for a second?