No, I'm not cheating, I am researching and getting my ideas straight 
Obviously they have an effect. People believe that what they see on TV is 100% real and true. And obviously if someone has made it to TV they must be the best in their field and have qualifications coming out of their ears. right? So people copy what they see on TV.
Whether this is good or bad would depend upon which trainer you are watching. I think a certain celeb trainer has a lot to answer for when it comes to death of dominance training being so slow.
Copying his methods could have disastrous consequences for both dog and owner, especially if his techniques were used on a fearful dog.
Other trainers use more positive methods which can only be good because positive training needs promoting in order to shush up the bull shit that is dominance theory. But even then, is it a good thing? It's so easy to misinterpret what you are being told/shown and get it wrong.
And what about we what we don't see? Those of us with problem dogs know that their issues cannot be solved in a 30 minute TV slot. But people new to dog owning may not realise this and might become disheartened when they don't see results as quickly.
There is also the risk that people may believe that watching a TV show is as good as going to a class, although on the other hand watching some TV shows is better than nothing, watching others is very, very bad. A book would be better than a TV show but even then is not as good as one to one sessions with experienced behaviourists.
People new to the world of dog training will struggle to weed out the charletons from the real behaviourists.
I need to turn ^ that into a 1000 word essay with references [panic]