It seems to me that the Canon AE-1 did have a huge impact on photography and the SLR, but, when I come to think of it, so much of its influence was semantics.
No small part of the success of the AE-1 was that Canon saw a huge marketplace and was highly effective in claiming it - selling SLR cameras to people who were not really into photography, not as a paid professional nor, even as an enthusiastic amateur. The market was baby boomers (fairly young in 1976) who may have felt that having an Instamatic X-15 hanging from their wrist belittled their self image.
Those who were not around then probably cannot imagine how much the advertising had to do with the AE-1's success. Their ad, showing a photographer taking pictures of a tennis pro, and then the tennis pro taking pictures of the photographer playing tennis, with the slogan "so advanced, it's simple", bombarded the TV airwaves (as the GEICO ads do today). The ad was even parodied by Saturday Night Live ("So simple, even Stevie Wonder can use it!").
The mass marketing caused many hobby and pro photogs to disrespect the AE-1 as a "toy", when nothing about the camera itself could be further from the truth, as the AE-1 was still a well made and highly competent imaging tool one expected and got from Canon.
I find it odd how much attention was put on the fact there was a microprocessor in the camera. It changed how the camera was made, but it did not really change what the AE-1 could do. It did the same things as the Konica T4 (which, to most is exactly what the TC did, as not many would pay for the optional extra autowinder).
Of course, to people who were not into learning photography, the AE-1 did have one huge drawback - it still did not have autofocus, and many an AE-1 buyer would get blurry prints back and stow the camera in a closet, which is why the AE-1 would be so available in the used market for years to come.