You are right with the lack of open source state of the art engines, it is a shame. But you are misinformed about the webgl part: There are other Web 3D engine

You are right with the lack of open source state of the art engines, it is a shame. But you are misinformed about the webgl part: There are other Web 3D engines. For example Babylon or CopperLicht. The latter even has a pretty solid WYSIWYG 3D editor: http://www.ambiera.com/coppercube/ http://www.ambiera.com/coppercube/