It is one of the goals, and they are still actively investing in that area, for example the sapphire plant they recently invested/built. However given how much cash they have ($150bil+), spending all of that on operation and manufacturing in a short amount of time is actually infeasible. A state of the art chip fabrication plant would only run you around $2bil these days, even if you build it in an expensive country like the U.S (kinda tells you how over-valued WhatsApp was huh), so even if Apple decides to build 20 of such plants (Intel only has around 10, and a lot of them are older ones)), they STILL have over $100 billion in CASH that they don't need, which is still more than any other tech companies' cash reserve.