How complete will Wine ever be for older apps?

[Jules Richardson]

Sort of an open-ended question to developers :)  It's obvious that Wine 
functionality will always lag behind Windows releases somewhat.

But how accurate / complete do people think it will eventually be against 
older Windows releases? Is much development work even still being done on 
things that don't quite work as expected within apps that were current at the 
time of say NT4?

I'm just trying to build up a picture in my head of whether there will come a 
day when Wine users can pick an app designed for a previous generation of 
Windows and expect it to work flawlessly (ignoring things that try to 
manipulate the hardware directly, I suppose)? Or will there always be 
incompatibilities?

cheers

Jules