well, ubuntu is also dropping support for 32-bit. they tried to a little while ago and got a lot of backlash so they're supporting for a bit longer, but it's only a matter of time.
I think they're dropping support for installation on 32-bit machines, not the 32-bit libraries needed to run 32-bit software on a 64-bit OS.
The former already happened. In this case it was the latter. this would have ruined wine right when stream was beginning to make running games with wine easy.