If power or the internet goes down, it's safe to assume that Bitcoin becomes practically worthless/useless in
The word is "unusable" not useless.
an instant for anyone who's living the aftermaths. We're talking about situations like the current one Lebanon is facing. Had this happened in a much larger nation like the US, I think Bitcoin would've confronted a huge sell-off and loss of interest/trust.
There are two problems here, first if you can't move your bitcoins you can't sell them off. Second is that if there is such an aftermath you can't use your fiat either so there is no point in selling bitcoin to get another unusable thing!
We currently have Blockstream's Satellite
In many ways, this is centralized because the satellite is owned by a company (located in US!) and they can decide what services they provide and to whom.
The reason? It's seemingly difficult for a beginner to set it up, it isn't the most portable thing you can have and it's not affordable for the regular guy. Can't see the regular Bitcoiner to own a Satellite setup.
Exactly. In my opinion if we can't use something with the tools we already have in our possession it is not going to be a widely used thing.
ham radios
The problem is range, it is too short. According to google it is between 3 to 28 kilometres (2 to 18 miles).
Besides any "disastrous event" could take out radio towers too making any kind of longer distance communication impossible.
There were some kind of radios that you could transmit over a range of up to .. 200 miles (or kms) as well?
I believe they use the towers (as booster) which is basically a middle man.