Besides, this isn't just about Blu-ray sales. Preparing these shows in HD will pay dividends in digital distribution. That's where the "real" money will be.
Problem is, that it has been out for more than a year here in the States and there is still no deal for domestic TV or digital distribution.
TNG HD is already being shown in the UK. I think TNG HD is also being sold on itunes right now.
I imagine the American networks are waiting until all the TNG seasons are remastered before buying the rerun rights.
I personally don't see any American network having any interest in buying VOY HD reruns. TOS and TNG have the nostalgic factor going for them, VOY doesn't.