I looked into Amazon Sumarian and it will likely fail. They're using the same idea I had for expanding Aframe.io webvr editor but instead of trying to make money on the program or app they are trying to force people to use their servers for storage and charging a crap load of money for it too if you want to actually use it for anything more than a basic experience.
So, designers won't use it because they lack full control and can't host on their own servers. Any one who knows how inexpensive aframe is won't use it due to the extra cost.
If they had sold it as a stand alone app with the option to allow them to host the data easily and kept their cost competitive they might have had something but they force the developer to use their servers.
It's sad how poor implementation can ruin a great idea.