Why?

Because they need to compete with HD DVD in the capacity race… er, uh…

Because this will really cement BRs superiority over SD DVD and now we will see massive consumer adoption… er, uh…

Bigger is better.  That’s what she said.

Actually, this might be applicable for putting whole TV seasons on one disk or something of that sort.

Why? Let’s start with a few good reasons:

1.) A safe, storable medium to which one can back up the contents of their computer, including purchased media downloads

2) An entire TV series on one disc

3.) Lower hardware prices thanks to the end of licensing fees for Dolby and DTS because uncompressed PCM becomes the standard

4.) The a amount of space that games, movie extras and other entertainment content takes on media is not shrinking

5.) Lower compression rates = better video quality, fewer artifacts

6.) Ultra HD 2048p content would have a delivery format

etc. etc. etc.