My thoughts on this is that it would be nice if 3D Warehouse provided a links button which shows URLs for the following for the selected model:
An image (.png)
The model (.skp)
The model in Collada DAE format (.dae)
The model in GL Transmission Format (.gltf) for embedding in webpages as 3d viewable objects.
Also (and my apologies if I am going off-track a bit), aside from Private or Public options for the model, there could perhaps also be a ‘Semi-Private’? option, that allows a model to not be found within the 3D Warehouse search engine (it is treated as private), but the model can be downloaded or viewed via the link.
This would allow you to share you model with friends, without it being public, or even post it in this forum, again without it being made public except via the forum.