Thought experiment: How to survive the ultimate challanges

[Sporally]

OK, as i mentioned in another thread i was going to post an idea about what other benefits than funny time travels via wormholes we could get from the wormholes. First of i have to mention this thread might seem kinda silly to some of you ppl, if so you are of course welcome to reply or just leave the thread - whatever you pick. If it catches your interest i would be very happy if you would let me know. Secondly, this is not how i personally think wormholes work, but since some ppl believe this is how wormholes work i just want to point of that i also 'hope' (don't think) this is how it works. Here we go.

Astroids, comets, supernovas, passing stars, black holes, unknown threat - the list of how mankind can forever be extinkt because of the threats from outer space is long. These are all things we have to deal with, and those with the biggest possibility is what we should take a look at first, i.e. astroids/comets. But we also know when mankind will be extinkt. Unless one of the other threats occur before that we can't deal with we know, unless Einstein was right on this one aswell, that we will be extinkt of either The Big Crounch or The Big Rip. So what can we do about it? I believe, ok i haven't search Google dry for this subject, we haven't heard many ideas on what to do.

Let's assume it will all end in The Big Rip, and let's assume the following for wormholes (and this is here i disagree what will happen):
If i went back in time and killed Hitler in 1933 and then went back to 2006, what will happen then? Personally i think we will see a new 2006, e.g. a WW2 between the US and Sovjet - i.e. the computer game Red Alert. But if, and only if you would get back to the world you left, then we have solved one big problem that could (maybe) ensure our eternal survival. Miners using the wormholes. In this way we will have unlimited matter and energy which we will never, not even a trillion years in the future, run dry off. If this is the case and we also assume the our existence will end with The Big Rip we should have a way of controlling the universe. Unless there is not only a local gravity in all matter (which we know there is) but also a universal anti-gravity, this could be what we need if we were to survive. I'm not talking 6 billion or 10 billion humans, but several trillion ppl could probably do this. Today we have fusion and fission as the greatest energy sources, but sooner or later (i know we are talking later) we will run dry of this aswell. Probably The Big Rip event would have occured before us running dry of energy, but just in the theory.

On the other hand if the wormholes work as i believe they do, we could just jump into the future and collect all the matter and energy we want (if the humans and aliens accept this ). And after this we can go to the day before and grap even more energy and matter.

Who was the scientist that said there was only a limit amount of matter and energy in the whole universe, which couldn't be changed?

I know there are other ways of doing this - e.g. just going back in time to the beginning with all the humans and live for several billion years, but in case ppl don't want to go - who can predict what we want it the future.

I hope you get my point, but maybe you have better ideas. So post all your comments on what i wrote or tell me your better ideas. Maybe i have forgotten an even more simple way to solve the survival of The Big Rip. So just post