In the sense that you are asking the question, YES- the internet is the worst thing that could happen to WTS.
Their biggest problems are self-induced but the internet makes them readily available to others.
Despite the fact that it was 30 years ago, I didn't know that a former Governing Body member wrote 2 books until I read something on the internet. I didn't know that WTS was a member of the United Nations for so long and had to embarassingly quit.
Even if people become aware of WTS problems without the internet, JW rules typically caused people to shun them and that was the end of that. The internet has allowed us to find each other and gather strength.