Although I do believe Fred Asbel has had a big impact on traditional bowhunting I do not think his book or video on shooting is the main reason. The resurgence of traditional equipment, and the interest in traditional archery, occurred before Fred’s book.
By the mid-70's the compound was already the dominate bow being used and, with the exception of Gail Martin, the other major equipment manufacturers of that time all but completely abandoned the stick bows. Gail did get into the compound market in a big way but not at the expense of traditional equipment, and he continued to offer a full line of traditional bows in addition to his line of compounds. It might also be noted that Gail never did pursue the crossbow as did Bear and Pearson Archery. There were also a few smaller bowyers out there making stick bows, Hill, Zebra, Bill Stewart, and the Wilson Brothers being a few. Also during the 70's Harvey Overshiner started a traditional archery publication that was very successful and had he been a better businessman, more honest with his subscribers, and more fair to his advertisers, this publication would probably today still be the biggest traditional magazine available. Although the magazine itself was published on cheap paper I still consider those magazines better than anything we have available today.
I think Fred’s biggest impact was starting and successfully operating Bighorn archery, offering quality custom stick bows. This during the 70's when the compound ruled. Took guts I think. Today we have more and more traditional bows and bowyers than ever and fewer high tech manufacturers, even though the modern bows still dominate. I don't know if we can contribute this to Fred and Bighorn but Bighorns success certainly helped. By keeping traditional archery exposed through his writing in magazines and seminars at state bowhunting organization banquets and shoots Fred also contributed a great deal to the health of our sport, more so than his book and video on shooting. I find it interesting that shortly after Fred left his position as president of P&Y the Club reversed a policy on equipment that had been established while he was in office.
As for his particular shooting style, I did not find anything particularly new in his book, although the style may have been forgotten by those who had moved on to the compound or those who started out shooting the compound.