That thread was dead from the start. The main person behind it (at the time) had never seen a dayan cube (you'd really need to know in great detail what does and doesn't work about existing cubes to have a chance at producing something that is better). Also I'm going to presume to get something really good you need to do a LOT of prototyping, which could easily cost thousands of dollars, let alone the start up cost of manufacturing. Unless you knew you could make something that would outperform any Dayan, there would be no point in actually getting it produced.
Also how would it work designing as a team, whoever makes a change to the cad file would probably need to get a prototype produced to see if the changes are useful, but then who would look at the prototype? would it be mailed between all the different people working on it. I think cube designing requires less people and more iterations.