In fairness, the need for 128-bit addressable systems will be when 64 address bits is not enough. That will be long before people are using 2^128 bytes on one s

In fairness, the need for 128-bit addressable systems will be when 64 address bits is not enough. That will be long before people are using 2^128 bytes on one system. So doing the calculation with 2^65 bytes would be a more even handed estimate of the machine that would require this