It's not about Windows long term support, it's about Wine long term support (which is much better than Windows own).
So I agree with your point that long term Wine offers better support than Linux native ABIs.
I doubt Windows ABIs are better than Linux native ones on their own long term wise (i.e. without Wine).
That said, it would be cool for someone to develop Wine-like wrapping of historic Linux ABIs into modern ones so you could have the same preservation effect.
There was for example such project for older SDL over new one.
So I agree with your point that long term Wine offers better support than Linux native ABIs.
I doubt Windows ABIs are better than Linux native ones on their own long term wise (i.e. without Wine).
That said, it would be cool for someone to develop Wine-like wrapping of historic Linux ABIs into modern ones so you could have the same preservation effect.
There was for example such project for older SDL over new one.