The whole point of moving to a 64bit architecture was to have the ability to address more RAM...Windows 9 was suppose to be true 64-bit and Windows 10 64/128-bit but we are no where near both. Still everything is 32-bit with some 64-bit software. Software and Hardware manufacturers need to sit down and get this going. Where are we today. When we left 8/16-bit for 32-bit. That was a start. Then they introduce 64-bit with 32-bit and we're still stuck.
64bit addressing should get us up to 16.8 million terabytes of RAM which is enough to back up half the internet to a RAM drive... at this point in time (and for probably the next decade or two) there is no reason to move to a 128bit architecture.