I would have laughed at you in 1994 if you told me most things are still 32 bit 20 years from now.
So... do you expect CPUs to be 128-bit in 2024?
Personally, I wouldn't be surprised if we stuck with 64-bit for a very long time. At least with respect to address space, it seems unlikely that we're going to have devices with tens of exbibytes of RAM. Or even addressable persistent storage which is touched enough that it's worthwhile having a flat address space.
2^64 is a really big number. 16 EiB = 16,384 PiB = 16,777,216 TiB = 17,179,869,184 GiB. I mean, yeah, Moore's Law and all, but even in a world where high-resolution holographic video records of entire lifetimes are common it's hard to see what machines would do with 18 billion GB, much less storage so much larger that bank-switching is inconvenient. 640,000 TiB should be enough for anyone.
And if we do make the jump to 128-bit, there will clearly never be any point in moving beyond that. Not for addressing, anyway. Not unless our computers are "made of something other than matter, and occupy something other than space", as Schneier put it.
I'd love to hear cogent counterarguments, though.