The people who control the currency are not as concerned about the future viability of the dollar as they are about how much power and wealth they can scam out of the system today. When the dollar crashes, they will have already converted their ill-gotten gains into another currency or commodity. They will not be wiped out.
edit: Let me backtrack a little...our military exploits might be weakening the dollar, but preventing Ghadaffi from using another form of payment strengthens the dollar (or at least prevents further weakening). Of course there is a point at which more wars to support the dollar will have little positive effect and major negative effects. Maybe that's the point at which the wars will end.
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