I would certainly be interested, but I'm not going with a subscription service for one show. I imagine there are a lot of people that think the same way. However, lots of people are paying for Netflix, Hulu, Amazon Prime, etc., so who knows how it will work out.
Not sure if I would do it for THIS Show, but $6 a month is pretty cheap compared to on demand/rental costs. A new release movie off comcast is $5-6 for 24 hour rental, so getting however many episodes of Star Trek for $6 a month seems pretty fair in comparison.