"because most PCs are running a 32-bit version of Windows,"
I'm pretty sure most PC's are running 64bit windows now.
Almost every OEM PC ships with windows 64bit and 4-8GB of ram, and most gamers, if you judge by steam's last survey are using 64bit systems with 64bit capable CPU's, just like their using mostly DX11 systems as well.
55% are using win7 64bit.
49% are using DX11.
But I do agree that this console generation gives me more hope then I originally felt, for not only more PC games, but better designed ones too, and hopefully using 64bit processing and DX11.
I just hope they stop using Always on DRM and calling it a feature.