The growth and development of bitcoin something unimaginable in the world. Bitcoin right now is on it growth level and have not enter ful the developmental stage of the coin. It is after this stage and when 40% of the countries have adopted the new technology then bitcoin will start it developmental process but as of now it is still on the growth level. All those mega companies mentioned by the op will definitely accept bitcoin, mostly Microsoft.
Bitcoin's growth has been remarkable, but it has not yet reached its full potential. Once 40% of countries adopt it, the developmental process will begin. Major companies like Microsoft are likely to accept Bitcoin. Exciting times ahead!