Disclaimer: I will answer some of your questions in the most bizarre/sarcastic way possible (for me at least) since most (all) of it has already been answered, and there's nothing I could possibly add, I suppose. No harm for some humor if I say so myself.
What will happen after satoshi dies?
The government will rejoice to know that satoshi, the creator of Bitcoin, died. They will think that Bitcoin will die along with satoshi and will never touch or lay a finger to Bitcoin even again (representation of how politicians see the internet).
When that happens, we will rejoice (users of Bitcoin), because the government will avert their eyes to one of their issues, and we will see the fruition of Bitcoin will utilize its optimal potential.
What will happen when bitcoin stands alone?
Once upon a time, our lord and savior Satoshi Nakamoto created Bitcoin (the virgin Ma--oh wait that's a different story), the lord was pleased by his creation and will do anything in his power to nurture her--after all, she's the only one of her kind.
Or so we thought, an excerpt from a certain book: "Go ye and multiply"--and the rest is history.
What will happen if it is banned globally?
Well, that sucks! Better find myself a job then. (AS IF!)
What if goverments start working on killing bitcoin?
Dont you think goverments can work on it to kill it?
They already did, I wonder how much money they've thrown away just to see it fail--and all those propaganda they did to no avail.
That's unlikely, we haven't had a virus that has the same manner. And besides If I'm the hacker (who creates viruses, whatever), I'd be the densest hacker in the world if I shut down the mining operations.
Btc is not like gold. You cant make the gold disappear suddenly as it is possible for btc. I am a fan of btc but I am also scared. It should be protected but who will do it? Exchanges? The top btc holder?
Blockchain my friend--worked since 2009.