I think it is time for you to switch focus.  From how easy it is for a government to 'hijack' Bitcoin to how difficult it would be for the same government to re-hijack Bitcoin once everybody forks to another algorithm.  I do not know how easy it is to switch to GPU mining, but I assume it would be one of the choices if possible and easy to apply.

Here is the hardest part of the hijacking thing.  Sure, let us say the government has enough resources and time to create the perfect mega mining rig to 'overtake' Bitcoin.  It would take HOURS at most for us to put everything back in place after which all their resources and effort become worthless and useless.

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Regards,
PrivacyG