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I am also not sure how long it lasts but I fail to see why it will matter whether you got the immunity from a vaccine or the normal way.

And let's say everybody get vaccine in 2 weeks period of time, if the immunity doesn't last at least few years what's the point of this mass vaccination then.

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It will stop the spread and die out if everyone gets a vaccination in short period. The virus can't survive outside a host very long so if everyone is immune even for a short period it has no one to spread to. It can be done country by country. Then only people that get the vaccination are allowed inside a country that is immune.

That is very unlikely to happen, if only because vaccines do not have anywhere close to 100% success rate and many people won't be vaccinated due to health reasons alone. Plus there will be animal reservoirs.

Nothing has this kind of success rates. Vaccine, if effective, reduces risk of vulnerable groups and transmission from their caretakers. Exactly like flu vaccination.

Heck, we have failed to eradicate polio in all countries, a level 1 virus much easier to control. I predict zero chance we can eradicate a level 2 virus right now.

Well people survive vaccination, so there's that

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