If Apple offered a watch that could be "serviced" , Id be more inclined to buy One. I guess we will know today.
Well the Gruber's of the world are approaching this product entirely from the luxury watch space, so let's go all the way then. Luxury watches have to be serviced. Certain Watch models will be 'serviced' too. For sure battery and possibly SiP. Or Apple will allow you to trade in just the watch component for a new on that will still work with your existing bands.