Perhaps I'm wrong. Is there any reason to believe that Lieberman has been prevented from clearly explaining his ideas on his own website?
Given this history, WHICH JUST HAPPENED IN THE LAST FEW YEARS, there is no credible reason to believe that ISPs would "just say no" during a real national emergency.
In a time of emergency and war, a large multinational is not going to bite the (large and powerful) hand that feeds them.
A related current example is BP with the oil spill. BP could very well have said fuck you to the Obama administration and not set aside a compensation fund. However, this would have been done at the cost of current and future federal government contracts.
There is no justification for this bill to exist, other than because these senators decided "If China can do it, then why can't we?"