I mean the OP's question is basically the entire premise for this website. I grow exclusively autos, but I will sometimes breed with Photo's because there is still a HUGE amount of genetic diversity in the photos that hasn't trickled down yet.
The thing is, I've never seen a ruderalis in person, all of the auto's we are dealing with today are numerous generations of cross's, back-crosses, and inbreeding removed from the ruderalis of 6-8 years ago. I'd be willing to wager that not a single one of the predominate known breeders is growing rudys for their breeding programs. There just isn't any reason to, the only thing that rudy had to offer was the autoflowering trait and that has now become common and easy to acquire from modern autos.
Autoflowering cannabis is the future of all cannabis. Mark my words, in 10 years 90% of all cannabis grown will be autos. They are easier to grow and care for, they are faster, and with modern techniques they yield just as well per/unit time. I remember my dad waiting 7-8 months the harvest old school mexican sativa trees in the 80s and then getting wiped out by an early frost in October. Now he's 70 and all he grows are autos right out between the tomatoes and the peppers. We wouldn't tolerate waiting months for photoperiod vegetables and in the future we wont tolerate waiting months for photoperiod ganga either.
Every day another of the great old legacy strains gets converted to autoflowering and another old school grower gets converted to growing the easy way - with autos.