to be a miner you need reliable and constant internet... and millions of dollars invested in equipment. and so if you can afford the ASICS then getting a couple satalite units tethered together is no issue

to be a full node requires reliable and constant internet... and the desire and motivation to not just be a user but to be a dedicated part of the network. there is no reason for everyone to be dedicated. and with an estimated 2mill people only 0.3% are running nodes. so i would say 0.3%-1% is a sufficient about of decentralized distribution ongoing.

as for regular users. if you have no internet then you wont know, want or need bitcoin. but even if you have basic internet just to write stuff on this forum. then you have enough internet capability to run a phone app/lite client.