I'd settle for a DVD remastering. I'm currently watching the 3rd season of DS9 on DVD, and I don't remember the image quality being quite that bad.
This is not going to happen. DS9 DVD sets have made their money and CBS Home Video knows it. TNG is still a property though that can bring in money and the next avenue would be syndication in high definition as well as Blu-ray releases of fan collectives to start.