Past the point of no return...

[hollywoodguy]

For everything that is already in the can, so to say, it's not going to get much better, certainly not on any format that has a chance in hell of going mainstream. Picture quality is already better than most theaters and audio is better than all. 95% of the limitations of a well-done disc is in the source material, not the format at this point. It's truly remarkable when you think about it.