I do not mean to be abrasive, but I feel that your examples were weak. Your second and third paragraphs address two different interpretations to your initial question: "So could we actually live without TV?" It is important that you clarify/reword this question. (I realize that what I am saying must sound confusing but bear with me.)
INTERPRETATIONS TO YOUR INITIAL QUESTION, "So could we actually live without TV?"
Do you mean to ask if people can live without sitting around a television set (by showing other ways of watching TV)?
Or do you mean to ask if people can live without watching television altogether (health concerns, etc.)?
In your second paragraph, you suggested that the Internet is an alternative
to watching television. In this way, you addressed the former interpretation to your initial question (asking if people can live without sitting around a television set by showing all of the technology available from which they can alternatively watch television).
However, your third paragraph paragraph supports the latter interpretation to your initial question (asking if people should forgo television altogether due to health concerns, social withdrawal, etc.).
My suggestion for you is to reword your initial question and pick one interpretation or the other. If you choose the former, provide other examples of ways television can be watched. If your choose the latter, continue to explain why watching television is a bad decision altogether.
I am very sorry if what I said is confusing-- it was confusing enough trying to articulate! Good luck with your essay!