And why not nvidia or amd, nvidia new generation seems to be delayed for ever, what is doing nvidia?, as you can imangine nvidia like apple or other major hardware manufacturers usually plan the development and the deadline to launch a product some years before the product is launched.

Nvidia and AMD could be doing the same as bitmain is doing if they find that mining is so profitable, can you imagine the R&D department of Nvidia working to develop the fastest and more efficient gpu miner based on their techonology?, I don`t know if what they would develop would be as efficient as an asic, but sure it would be close to, with everything optimized to mine,optimized drivers and optimized cooling.  I know, I have not any proof,is just a theory, but why not?