It looks like the Nexus 9 is not the only device that has been ousted from the Google Play Store. The Moto 360 Sport is no longer available on the Play Store either. You can still find the device fro sale from Amazon and from Motorola themselves, but apparently sales were so lackluster that it no longer deserves a spot on the Play Store.
To be clear, the Moto 360 Sport image and details are still at the Play Store landing page. There is simply a header which states "this devices is no longer available in your country," and there is no way to order one. This is obviously a bit different than the Nexus 9 which was completely erased from the Play Store in any form. Sill, the writing is on the wall that it probably won't be returning.
What's really surprising is how fast it was pulled. The Moto 360 Sport was only launched in January of this year. Perhaps its $300 dollar price tag simply proved too off-putting for most consumers.