Right now it seems that TNG in HD isn't doing as well as we first thought it might. There was a bit of a hype with the first few seasons and 1-3 consistently ranked within the top 100 blu rays at amazon even several months after their release. Look at season 5 now, it's nowhere to be seen let alone the previous seasons.
That is simply down to their rushed release schedule. I haven't gotten through the whole of season three
yet and I will buy season four when I have. I probably won't be buying season five until next spring.
I guess this is definitely something to consider. I'm a "binge watcher" for want of a better term. It usually takes me about a week to get through a season!
However, like MikeS
, I do have friends who take it at a far more leisurely pace. How many potential future sales this translates to I'm not sure about though.