In my opinion, having 3D Modelling as the overarching site would do better than having a site dedicated to Blender, or Maya, or any other 3d modelling software, for that matter.
There was a generic 3D modelling proposal, (which I believe started life as a pure Blender proposal, but expanded in scope to get enough traction).
It was shut down by the SE team after one month in private beta (i.e. before it even had a chance to prove itself).
The points made above are good points. I would argue, however, that limiting the scope is useful. Personally, I'll never be a user of Maya or 3DSMax. The scope of my work doesn't justify such an expensive modelling tool. Blender, on the other hand, allows me to pursue 3D modelling as a hobby. Unless another full-featured, free and open-source modelling tool arrives on the scene, blender is likely the only thing I will use. If I saw tips and tricks being discussed on other software, it's value might be considerably diminished. In fact, my support of this proposal was based on the specificity of the proposal.
When talking about modelling only, you should certainly have included Z-Brush as an example. But as far as I can read it from the example questions in this proposal, it is about other stuff too: Materials, texturing, lighting, physics, particles, nodes, ...,game engine, user interface.
So I would assume that your questions means something like "shouldn't this proposal be broadened to include other 3d-Software as well?". If this is the question, I think that 1 provides a lot answers to your question.
However, I think that you have a point, when you think that there are probably too few people on this site and we should do something about that.
One possible reason not to have “3D Modeling” is because the scope there is quite narrow.
Consider Blender has shading languages (OSL, GLSL), a video editor, scripting API, sculpting, painting system, compositing, motion tracking, game engine... etc.
Perhaps there could be a "3D Content Creation" stack-exchange - but this is also very broad, however it at least is a close analogy to Stack-Overflow being a programming language forum.
I like the idea of a general 3d-package site. A site for only 3d modeling wouldn't be sufficent, as others have answered, because of the possibilities of blender (and other 3d software).
The mechanism of favorite-/ignored-tags on SE sites makes it easy to hide unwanted questions or highlight questions for your preferred tags.
Des tutoriels destiner a d'autres logiciels (3ds-maya) m'ont bien aidé du point de vu de la créativité, mais de la à réussir l'effet dans Blender ça n'as pas toujours réussit tout de suite, voir même pas du tout . Chaque plate forme ayant ces particularités . Regarder comment Blender a évoluer depuis les premières versions, pas uniquement l'évolution de la plate forme, mais de quelle manière Blender est devenu ce qu'il est maintenant sous l'impulsion de Ton et d'un groupe de personne . Le bac a sable est devenu une magnifique plage avec des cocotiers et tout et tout . Alors 3d ma foi oui, mais avec Blender au centre .