I think the 32s will still retire first despite these rotting issues some 46s supposedly have. At this point the only thing in good shape about the 32s is their bodies, I seen 32s two to three cut out doors on one car, they don't stop smoothly, their MDBF is low and their A/C units break down a lot. I still like the 32s but they certainly have seen better days..
The rotting 46s can run a few extra months.. no biggie IMO.