This is a no brainer
We have 7 billion people on this planet only and a 32 bit OS can only address 4 billion adresses
We know that we will need a 1024 bit OS and processor eventually
and not something bigger in this universe,as the number of atoms in this universe is contained in this 2^1024 number
So why not build it now?
we skip the unpleasans 32 to 64 bit transitions like in the future