W1: Summary

A great idea, but not really much used
They make sense only for remote thermometers in a noisy environment
Or as "smart" keys in their "button" mechanical case

W1 thermometers are very expensive
More than 1 EUR, compared to 3-7 cents
And they can't even be deployed in strings (geographical issue)

The sequential serial number is a useful resource
You can use the LSB to create your own MAC address
Please use the "locally assigned" address space
But if your uC has a serial number, you can use that one

You can even find "MAC address" devices
The address a real IEEE-blessed MAC address
2 EUR each if you get 1000 of them!!

A niche market, for rich makers