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.
They are now seeing the potential of the bitcoin self this could be a good sign that the countries would like to adopt the use of the bitcoin technology not only this but of course the security this offers, we know not all country accept this because they cant afford or they don't want this becomes dominate their country so they prohibit the use of it but to those willing to adopt they already supported this as one of their mode of payment, can be use for their deposits and withdrawals using the ATM's and many more but the bitcoin itself becomes now a centralized use not the purpose of it becomes decentralized is the user willing to deal with that or not that's the case now.