Sure it makes sense. They won't want remastered Trek competing with new Trek for syndication, streaming and home video dollars.
Just speaking for myself, I really don't give a shit about these remastered shows, and find them rather pointless. However, if a new series came along, I would certainly watch it. And if I enjoyed it, I would buy DVDs and other merchandise.
I'm not sure if that's how the majority feels, but I'm guessing that these remastered series are pretty niche.