I agree there has always been poor researchers. It used to be expensive to publish a family history so that in itself limited the field. There are books filled with errors.
The internet is not the problem. It has been around a very long time. The World Wide Web (1994) made it easy for a non-professional to make web pages but it took a while for items to get online and software to be developed, not to mention better search engines.
I recall way back in 1999 I was in a coffee shop in Germany talking to a couple from Scotland. I mentioned I was doing some genealogical research in Germany. "Why are you doing that? It is all on the web!" If you think back there was very little on the web then.
My husband's grandfather researched back in the 1930s. For the time period he did a good job. He didn't cite one source. I have looked it over made so corrections and additions (not welcome) and forgot it. Today the family still says, "We don't have to do anything Grandpa did it."
I am sorry if I am incorrect on the latest online versions of FTM. My cousintold me that after she ordered 2008 and immediately went back to 2006.