Why, those people do that without a cellphone? I bet 90% of them have a cell with them...(except for swim/surf)
When I climb hills or mountains, I generally keep my cellphone in a waterproof case, in case the weather turns bad, as it's not waterproof. It's not convenient therefore to be pulling this out to check to the time.
Swimming and surfing we have already dealt with.
Cycling. Again, it's not convenient to be reaching for a cellphone while cycling, it's safer to look at a watch.
When out running, I do take a cellphone. I have an old, small flip phone on a pay-as-you-go contract, I redirect calls to, and have for emergencies. It sits inside a velcro'd down pocket of a reflective belt I have, and again, it's not the easiest thing to reach for while running. It's far better to check the time on my Suunto, which is also timing my run (does your cellphone clock have a stopwatch, with lap/split times? I bet not!), and telling me the time, and my altitude.
On watch, sorrym wristwatch sales being down, well, perhaps it's something to do with lazy fat urban teenagers?
"The US Department of Health and Human Services recently published teen obesity statistics regarding this dangerous trend.
According to the report, 14% of adolescents in the United States are overweight. This figure has nearly tripled in the last 20 years. " (http://www.troubledteen101.com/articles42.html)
Less sporty obese teens don't need a stopwatch, do they? Not unless they are timing how fast they can scarf their burgers.
The wristwatch is not dead. It's just people turning their back on outdoor pursuits, where one is an asset.