For my part, I am unconcerned with the GPU requirements. It's been my plan all along to purpose build a system to run the X whether that means dual 1080 ti's, the new titan or the new volta. I had thought the volta would be out by the time the X is anyways.
As to why only 400 of the X were sold, well, that was at least partly explained in the beginning when the idea of the X was only theoretical Also it cost $1k which kind of puts it at the high end of the market. I would have expected that someone would be charged with keeping a timeline on the X even if that person is just waiting for the 5/8 to get done there are still things to do. I have personal experience working in manufacturing and without some explanation why, I find it incongruous that no one is doing anything. Unless maybe Pimax really is just a company of 10 people.
My personal experience had to do with a company that made educational software.
My chief concern is the lack of any updates concerning the X.