a 3 series starts at 33k but reguardless of rounding a fully loaded honda accord isnt going to go to 5k in 5 yrs.A $30,000 car is more like a fully equipped Honda Accord. A BMW 1 series starts around $35,000. The 3 series is into the $40,000s if you want luxury features like a folding rear seat.
3 paragraphs, not 1 useful idea for wearables listed. my point still standsAs smartphones have gotten bigger, they have also become less convenient. I think if the Sport gets GPS runners will buy it. People don't like to do their morning runs with their phones anymore. The technology isn't quite there but will be soon. The LG Urbane and Samsung Gear S are about 75% there, but the watches are too big for many people.
Accessories by definition don't replace anything, but they do complement other things. These devices don't need to do much, if anything that the phone can't, except for the health and fitness functions. Women are going to be wearing bracelets for a long time. If those bracelets can be functional and aesthetically pleasing, they can serve a purpose. It doesn't make commercial sense yet for Apple or anyone else to make a whole line of "smart" bracelets, watches, necklaces, etc. but that day could come.
Remember, it's only over the last 15 years or so that watches in general fell out of favor, and they still are big sellers in absolute terms. Go to any shopping mall and there are lots of stores selling watches. $350-$1100 is at the high end of the mall watch category, but certainly not unreasonable.
also your premise that smartphones getting bigger has made them less convenient is false. going from 3.5 to 4 and 4.7 inches has increased convenience. It's only phables over 5" that start becoming inconvenient.