I think Zigbee is in the uptick. Philips Hue works with it. Ikea is aggressively pushing products. There is (was? website recently went down, perhaps it has something to do with this announcement) DotDot (https://en.wikipedia.org/wiki/ZigBee#Cluster_Library) based on Thread. Which is used by Nest/Google.
Zigbee is used all the time in smart lights, plugs, doorbells, temperature sensors and the such. It's a very popular standard.
I personally have seen more Z-Wave devices than Zigbee in the wild.
Just yesterday Aqara (Xiaomi) launched their Amazon storefront. All their devices are Zigbee and had mostly only been available from places like Aliexpress. Zigbee is far from a dead standard.
The vast majority of budget devices I have found are ZigBee: