That's a big mistake. From personal experience, WiFi coverage in people's homes isn't always very good. Is ZigBee a mesh protocol like zwave is? That's the strongest part of the zwave system, that all the devices can talk to each other. I have many issues with zwave, but that's the best aspect.
Zigbee does mesh, yes, but if your devices are battery powered, they won't improve the mesh - they'll just be leaves. The power consumption to be a zigbee router node (or whatever it's called) is not compatible with being battery powered.
Nest protect is also not really Zigbee, or anything else standard, from what I hear. It uses an 802.15.4 radio, but so do lots of things.
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