Its not so much whether poser could handle it, it's whether the community would want it.

The best place to market that level of modeling skill would be to film/game studios (in the form of demo reels), or higher end sites like squid, where you'll actually get more of your time's worth payment. Occasionally you may find poser models approaching that level of detail/professionalism but very few in the poser community would be willing to pay the prices required to make the time investment worth it. 

In many instances its actually easier, and faster, to rig models like this for games. The underlying geometry is usually relatively simple and straightforward (very different from most geometry used in poser figures) and utilizes geo swapping where necessary. 

 

~Shane