That’s a really insightful historical analysis. However, I don’t think that quite addresses the point the author is trying to make. Perhaps I’m overstepping the mark slightly, but I think the author would claim that it doesn’t matter if it takes another 100 years or a 1000 years more for democratic societies to form. What does matter (for the author) is that they would form, and that when they did, that story would be the history we have today.
However, I do think the points you make about the history are interesting, and perhaps an engrossing thought exercise is to contemplate how the world might look in the 21st century without the American Revolution taking place when it did. Apologies if I’ve misinterpreted your or the author’s points.
Your point about it being difficult to leave society is one of the most common objections to social contract theory. However, you have misunderstood what implicit consent is. This article offers a clear explanation of what explicit and implicit consent are. I recommend reading it in full, but I’ll quickly draw out the most relevant sections.
This is the form of contract that you spoke about as “consent” above.
This is what is meant by implicit consent. Implicit consent is different from the person disagreeing because they still take the action they would if they explicitly consented, from which it can be deducted that they do consent. By ordering the burger, it can be known that you consent to paying for it. If the waitress brought you the burger and you denied to pay, this would be ridiculous as you consented to pay when you ordered it. Does this make sense? To not consent would be to not order the burger in the first place.
There is also a third kind explored in the article, hypothetical consent, which might be worth a read. I do acknowledge your question on ‘what people need to do so that people stop saying you consent’ is difficult to answer, but it is one of the most central questions in social contract theory. As such, I don’t have a single answer for you, but I hope this was able to clear up a little what ‘implicit consent’ actually means. If you’d like to discuss more on what this barrier of consent is, I’d be happy to discuss further.