subscription-only will ensure a quick death
Of the major broadcast networks in the US, CBS is the only one that charges for online content - but only under specifically weird circumstances. I can watch recent episodes of current shows for free on my laptop, but I must pay to do that with my Roku or Android device?!? The other networks all allow you to stream pretty much anything they offer for free, regardless of method.
Assuming this new Star Trek is even worth watching (and that is definitely NOT a given); if it is subscription only and NOT also on other popular subscription platforms like Netflix/Hulu/Amazon Prime, then it simply cannot last. There aren't enough people who will pay USD$6/month to watch one show. Oh, and you still are privileged to watch commercials. Granted, paying customers see "fewer" of them but, you cannot fast forward or otherwise bypass them. No thank you.