Cool piece of technology, though I can imagine that it would be costly to have it on all the keys (as opposed to just W, A, S, D). It is also a bit of a shame that it'll probably only be featured on Corsair keyboards, but I guess it will only be a matter of time before such fancy transparent Cherry MX housing be cloned and maybe starting with single LED to be hitting the market afterwards. It is all probably due in a matter of time. If and when that happens, maybe the technololgy won't be so costly and rare.
The idea behind it is fairly ideal but to have one or two companies benefitting the idea can only last for so long in the open market where Cherry MX switches are ever so popular.