Costs and logistics aside, I'd rather not see TNG remastered. I watch the old episodes, and I don't the special effects are so awful as to warrant a second crack at what the special effects people may have wanted in a perfect world.
If they do a remasterd TNG the primary objective would not be to improve the visual effects (though the may do that too). The objective would be to make it look half way decent on HDTVs.
As I mentioned earlier there is really no choice. Either they make an HD version of TNG or watch it fade into obscurity. I think what they are hoping for is for the upconversion/interpolation technology to improve to a point that they could use that instead of redoing the entire post prodcution.