But why are you concerned? What's in it for you if the watch is a success or a bust?
I think he outlined his concerns pretty straight forward there. If this launch version of the Watch is a bust, there will be inevitable repercussions on future releases. To the most extreme (and not going to happen, IMO) of Apple tapping out of the Watch market and never releasing another iteration. Thus those who love the Watch would not get future versions/updates. A more likely scenario would be if it under performs Apple would not devote all the resources to innovating and updating for future versions as they would if the initial product is a success. Thus Apple Watch lovers would be getting inferior future versions than they would if the Watch is a success.