If you are running Wine to run Windows apps on Ubuntu, then you are running Windows apps, one way or other. Wine appears to have some inability to move to 64bit, but that is not a problem of Ubuntu or Linux in general. There’s such a cry over the matter that 32 bit apps (say games) might not be able to run on Ubuntu 64bit. The games (developers) would do 64bit, if and when the gaming platform (meaning Windows) stop supporting 32 bit. The developers of apps (games) don’t dictate terms, the OS dictates the terms.
We, at Linux sort of can’t dictate terms, which is really sad.
One day, the OS owner would stop supporting the 32 bit OS, and the 32bit software and I’ll be left with nice little 32bit Windows OS device. I don’t game, but all those 32 bit software would be obsolete. The thing is, all the app developers would have to move to 64 bit, or lose business.
So, Ubuntu , if it wants/needs should move to 64 bit right away, without any outside dictate. By the time, the rest of the world is forced to move to 64 bit, Ubuntu would be miles ahead.