Also, no computers at all and no internet.. in this case I don't see it happening, even theoretically speaking.
There is no Bitcoin without the internet. Technically as soon as some people (nodes, miners) regained their connections the network could 'jump-start' again, but at this point we would only be speculating (as we can't be sure what is exactly going to happen).
Can Bitcoin survive without computers existing?
Seems like I've overlooked this part; the answer is certainly no.