I’m not American either lol

Every day he lives is another day full of hope that he dies soon. I’m a “glass still has a few drops” sort of guy.

Does the vice-president-elect get inaugurated as president if the president-elect dies before that day?

Read section 3: https://constitution.congress.gov/constitution/amendment-20/

short answer: yes

Maybe you’re right and the second one is yet to make his attempt and fail.

Similarly to how we have it here in Hungary :(

Apart from the very close one, there was also the guy hiding around Trump’s golf club with a gun.

Yeah, but it would make my day, at least. Also, I think he would have less support than Trump.