Exactly. I first realized what a problem this was going to be when I walked into an Apple Store where most of the employees were wearing Apple Watches, all appearing as identical lifeless black voids on their wrists, like part of a uniform. Even the individual bands couldn't compensate that observation. Now that the watches are more ubiquitous, the same thing is starting to happen in the general public. Office meetings where most people have identical black squares on their wrists, where there were once fashion statements of individuality that matched their "look". It seems to me Apple may be self aware enough, and still have enough acquired fashion sense to know when it's time for a change. Series 4 is likely it -- including possibly changing the connector for a different set of bands for the new model. The Series 3 will continue to be sold with some upgrades. So customers may end up with several Apple watches they interchange throughout the week, as many people who wear watches do now.
Not necessarily. It all depends on the application -- but most would probably compensate just fine.
Oh here we go again. The watch was never intended for reading lots of data. Jony Ive even said the watch was designed for quick glances, and anything more one should pull out their phone. Indeed the watch is the absolute worst medium for extended viewing of anything, especially data.
Further, TVs don't display data. They display pictures. The only reason we don't have round TVs is because the original film medium was square. But practically speaking, a round TV would actually solve a lot of problems created by mobile phones and the ever increasing vertical movies being shot on them. When a newscast switches to a vertical display, rather than reduce the image significantly with extra wide pillar bars, the image would just rotate to a full screen version on a round TV. A round TV could show any aspect ratio, including IMAX with very little picture loss, and so forth.
Phones don't make sense because they would take extra space in ones pocket to carry around.
Regardless watches are more fashion than function. That's why there are round picture frames, despite the inherent square shape of the image. There is no concrete evidence that watches were round for mechanical reasons. Original clocks were square. There's no advantage to squeezing gears and mechanisms into a round shape versus a square shape. Indeed there have been plenty of square watches since the invention of them, despite your claim of so-called "mechanical reasons". So this isn't about practicality, it almost never has been. Since watches came into vogue, the customer choice has almost always been about style and fashion. As Jony Ive also stated -- once a customer wears something, there is the expectation of choice.
The round watch is not going away, just because it does more than tell time now -- indeed they have done that for many years. The watch has been and likely always will be used differently by different people. Some will prefer to maximize the screen real estate so they can go around reading and responding to extensive correspondence on their wrists. Others will be satisfied with short notifications, for which they can produce their phones should they desire to go more in-depth, using an appropriate medium -- something with a round or square screen can do equally well to suit a customers unique taste or style.