Ask HN: How long do you think we have until 64 bit is no longer enough?

Computing started out from the brains of men. Then we use writing tools to write it it out, and then we invented machines to help us compute. From abacus to analog machines to digital ones. This evolved from single bit to four, eight, sixteen, thirty two and nowadays sixty four. What an amazing journey it has been. I remember when 32 bit was all the rage. Nowadays 32 bit machines are no longer viable for dealing data larger than 4Gib.

So today we're at 64. 2^64 is not small for most of what our computing needs are. How long do you think it's going to stay viable for the masses? I hoping to spark interesting discussions, anecdotes, stories and what not from the HN crowd, perhaps throughout the weekend :)