> Can anyone guarantee those things?

No one can guarantee those things.

No one can guarantee anything in this world.

You are free to choose non existence but others are equally free to be brave enough to wake up in a worse world.

They may even feel responsible enough to try and fix it rather than requiring a "guarantee".

> The assumption being that, this "new world" is a better place than where you are now.

No one is assuming that. At least, I am not assuming that. Even if the world gets worse, I think it is rational to want to live longer and try and fix that.

Even if it is provably 100% unfixable and worse, any existence is better than non existence (certain forms of Hindu/Buddhist meditation teach you how to get into a state where that is obvious).

> This view is grounded in the assumption that the future will be better than today. There is no guarantee of that.

It could be better, it could be flawed in the same ways, it could be flawed but in different ways, or it could be worse altogether. Compare our current lives with someone a century ago. Two centuries. A millenia. Plus hey if you wake up and the oceans have boiled off, there's solutions to your continued existence then.

> I know for a fact that I will grow tired of existence.

I think that's the main part - ceasing to exist should be a choice. It wasn't one to be brought into this world, but inhabiting it and going out of it should be done on one's own terms and when having lived as good of a long life as one might want to. For some people that will be close to a century. For others that might be a thousand years. Who knows, for some it might be a million years.

If this is all thought experiments, why not? At that point, why even care about waking up in a capitalist dystopian hellhole? Might take a few centuries to overthrow them but it's not like that sort of life is the end point of humanity. And if it is, at least you'd know that for sure. Or maybe it's nuclear winter. Or something closer to a utopia, or at least something where everyone's basic needs are more or less met. Asking for guarantees doesn't work either way.

If a large number of people get reanimated, I don't think this will be their fate.

I can imagine "educators" who can get them up speed. In a future where people get reanimated, I would think this shouldn't be a problem long term.

Any existence may be better than non existence.

> You will be an audience member to a show you don’t understand, until you die.

I mean - I barely understand what I’m seeing in the world now. Maybe I can look back on now and understand it with the benefit of unclassified files and whatnot?

Fall, Or Dodge in Hell (Neil Stephenson) and The Waves (Ken Liu) are two other good stories about brain scanning and transhumanism. The first one is a ridiculously long novel about a future where the cloud is increasingly used for uploading souls of scanned brains, and the second one is a short story where people on a spaceship eventually evolve into noncorporal beings.

Groundhog day was perhaps the wrong phrase to use. In any case I don't believe people would spontaneously attempt meaningful self-improvement with any seriousness if there was no expected finality to our existence. Don't forget, Bill Murray's character has to kill himself numerous times before he makes any kind of worthwhile progress.