assuming bitcoin were the main currency, then, as soon as political pressure grew strong enough to demand real monetary flexibility, (e.g. to track a business cycle and reduce unemployment, or to fight a deflationary spiral) someone (in government) would start innovating.

that innovation could mean replacing bitcoin with another currency through forceful governmental intervention of some kind. or it might mean modifying (i.e. distorting/destroying) bitcoin's current protocols or algos. bitcoin is in its early stages, but so are governmental efforts to regulate it.