By media hosting, I'm assuming you mean voxels and SHPs and such?
For the time being, YR Argentina fulfils this role.
Yes, but that defeats the purpose of pulling in an active crowd directly to this forum.
The only media type we don't appear to have hosting for is 3D models, for the likes of Generals and later games. This is certainly an option we can provide for, if people are willing to submit such material.
It might not be as active at voxels and shps, due to the lack of modelers in the community vs 2d artists.. but maybe. just maybe it could have an impact on activity.