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In the absence of outside involvement, I'd guess that Orbital dusts off the wreckage and tries again in a while. Its got a contract and I'm sure its got insurance. However, Elon Musk has been trying to block Rooskie engines in US rockets and this would be his chance to push a little harder to knock out a competitor, maybe two if he can block the Atlas V over its engines. (Nicely commiserative tweet he sent to Orbital, though.)