My concern is that this is happening 12 years to late. A bunch of embedded stuff will not be replaced in 12 years. We have a lot more tiny devices running all s

My concern is that this is happening 12 years to late. A bunch of embedded stuff will not be replaced in 12 years. We have a lot more tiny devices running all sorts of system, many more than we did 25 years ago. These are frequently in hard to reach places, manufacturers have gone out of business, no updates will be available and no one is going to 2038 validate those devices and their output. Many of the device going into production now won't have 64bit time, they'll still run version of Linux that was certified, or randomly worked, in 2015. I hope you're right, but in any case it will be worse than Y2K.