As others have said, if things get that bad that we have no power and no internet then not being able to get to your BTC is the least of your problems.
The run on banks for cash, is one thing, but if you want to buy something unless the merchant also has some way of converting the BTC that you could get them through whatever method to something they want (cash / gold / whatever) then they will probably not take it.

As for satellite, with starlink coming online and kuiper a few years off and there was another one whos name I don't remember although they will be controlled by big corporate entities there should be enough different ones out there to keep prices low and bandwidth up.

Ham radios and such will never be able to keep up and if you think that blockstream satellite is expensive, look at the price of a good ham rig and antenna.

-Dave