I wouldn't say no, I've seen decompilers before.

It's possible to "recreate" a program, it's just a matter of having the right software. I just don't know of one for PBP, or MPASM.

All the information is there, except for comments, I believe those are lost. Same with fancy formatting and indentation, the best you could wish for out of decompiling would be a straightforward program.

EDIT: Here's some info on decompilers:

http://www.program-transformation.or.../DeCompilation