Will older films be produced on blu-ray or HD?

You would be suprised at the quality and condition of some of the older films from the 40s, when and if they are transfered to HD they will be superior to the current dvd format.

All movies that were originally film have a higher resolution that 1080p, whether they are introduced in 1080 is up to the company that owns the rights to the movie. The actual quality of the copy is determined by the quality of the transfer as the original film quality is superior to 1080P. I would guess that if HD or Blue-ray become the standard, then yes all films will eventually be available in that format. Taking into account that the quality of the transfer just like in audio is in the hands of the engineer.
Some will be great and some will be inferior.