Since ultimately you're deciding whether x86 is still worthy of spending effort to support, I'm listing several facts about x86 for Android devices here:
- Intel had decided to discontinue the Atom line for phones/tablets.
- The last generation of handheld Atom - x3, x5 and x7 series - were at best equipped on lower-end Chinese Android tablets. Some come with phone/data capabilities (based on x3-C3230RK). Regardless, none made it onto mainstream devices, specifically phones.
- The last x86 Android device that's widely popular was ASUS' Zenfone 2, released in March 2015 - and even its subsequent variants shifted to Qualcomm's Snapdragon 410/615, partly due to the compatibility issues Android on x86 had back then.
- Spreadtrum has a partnership with Intel and just announced SC9861G-IA in March 2017 / SC9853I in August 2017. However, this has yet to come to fruition on consumer devices, and given Spreadtrum's focus on low-end devices for emerging markets, this SoC likely won't give much x86 on Android much significance.
EDIT: The first device utilizing the above Spreadtrum SoCs, the Leagoo T5c, is now on pre-sale. Leagoo is a small China-based firm, and the device mainly targets India, not to mention another variant of the same device (the T5) with a conventional SoC is sold at the same time, so it doesn't change the assumptions above that it will remain unpopular.