I think so, yeah. It would take a massive ideological realignment in the country, and a concerted effort to understand the world in a fundamentally different manner than we do now. But I think it's possible. The fact is, we really cannot keep going the way we're going. As long as we stay on this path the threats that are already manifesting themselves (terrorism, climate change, economic collapse) are only going to intensify and newer, more dangerous threats are certain to arise.
I think the problems you're referring to actually require strong US leadership a la Bush I and Clinton (in grand strategy parlance, engagement). A Ron Paul or Dennis Kucinich type turn by the US would be antithetical to solving the three problems that you've mentioned.
Again, I have to disagree. I think most of George HW Bush's & Clinton's foreign policies were pretty successful, from stopping Iraqi aggression against Kuwait to stopping genocide in the Balkans. I don't want to go into list mode again and tick off gtd, but I don't think your statement is accurate with respect to those two presidencies. Bush II and Reagan, yep.
I guess you're referring to the drone strikes in Pakistan here? I agree that these are problematic and are pissing off Pakistanis. But it seems pretty clear that Zardari wants the strikes and just criticizes them for show. These areas are being used as a haven for terrorists, and the drone strikes are a much better option that sending in US troops. The Pakistani military or intelligence services obviously aren't going to anything about it, so I think right now it's the best of many bad options we have.