Mate, 50 years wasn't that long ago. We had computers and everything else we have now. We still did a lot of things fundamentally the same way. Everything was just slower and smaller (in scale; not physically)

I think you also should realize much of the world continues on without bleeding-edge technology - homes are still built, crops are still harvested, and the world goes on.

I don't think this is likely, but say we, the whole world, goes back to using telephones and writing paperwork on paper.

I don't think it'd be the end of life as we know it.