Apple is taking huge gobs of marketshare from high end Android phones most of which are using Qualcomm Snapdragons. To worsen things Snapdragon 810 was a huge disappointment. Samsung got to 14nm FINFET roughly a year earlier than Qualcomm. Mediatek is also competing fiercely. For Qualcomm 2016 is do or die. They need to hit this one out of the park with Snapdragon 820 and the lower models using 14nm FINFET or they are going to keep losing market share and revenue.
Qualcomm's case is a classic case of resting on one's laurels and taking the foot off the accelerator. Qualcomm dominated the 28nm generation with the Snapdragon 800/801 and the custom ARM core called Krait was very power efficient. Through 2013 and 2014 Qualcomm was able to ride on the success of S800/801 as they dominated the high end Android phone market.
http://www.anandtech.com/show/7082/...ce-preview-qualcomm-mobile-development-tablet
But their roadmap was not strong. They were caught napping in the transition to 64 bit ARMv8-A. Apple thrashed the competition by getting the first custom ARMv8-A core 2+ years before any other ARM licensee. Qualcomm had to rush and use ARM Cortex A57 and A53 cores in their SoCs and they still faced issues with overheating in S 810. Qualcomm has pretty much lost all the reputation and brand value (along with lots of market share) they built in the 28nm generation. Next year will decide if Qualcomm will bounce back. If S 820 disappoints its pretty much game over. Apple is innovating at a relentless pace. Next year I expect to see A10/A10X using Symmetric multi threading (SMT) to bring 4/6 cores to iPhone/iPad. Those are going to be class leading in performance and efficiency. Right now Qualcomm needs to close the gap with Apple and try and reduce the market share loss. I don't think Qualcomm can stop the loss of market share to iOS/iPhone entirely.