Of course mobile phones will destroy us, but not the entire Earth - only Humanity.
This can be seen in the way that more and more people are only able to interact with other people that are not in the same room and only by SMS a.k.a. text messaging and by talking on their mobile phones, while communication with persons in their vicinity is getting more and more scarce.
This is the reason why birth rates are dropping dramatically in all countries where 2nd and later generation mobile phone technology is widespread.