I thought I'd post this up in case someone with industry connections sees it and wants to implement it. The concept would be to take girls who have been retired for "x" amount of time and bring them back to shoot new scenes.
They could have different series based on how long the girls have been retired. For instance, 5 years out of retirement, 10 years out of retirement and so on.
So someone like Asia Carrera, Melissa Hill, Kelly Stafford, etc could come back and shoot one scene for the series. As porn fans, it would be interesting to see them back in action after being out of the business for a while.
Of course, many of them might not want to come back due to families and so on, but I'll bet there are plenty that could be enticed to come back to make a DVD series out of it. Depending on how early the girls got started and how early they quit, a porn studio could find women in their 20's, 30's, 40's, 50's, etc to meet the 5 year retired criteria. So they don't all need to be MILF type films.
In any event, just throwing the idea out there. :)