We thought Y2K38 would be the next big industry challenge, but I expect a lot of things are going to go wrong with a change with just a year or two of notice.
I love that this is happening, but I'm pretty certain a lot of random things are going to break when the cutover happens.
When they shifted the transition time by a month a few years back I remember it causing grief. I had to get rid of an alarm clock that was hard-wired for the old cutover. There were a few other minor inconveniences. Random things definitely broke.
The way they do it is just so self-destructive. Changing the definition of timezone, not just changing to existing one... That is so lovely corner case to remember forever... Idiots...
I love that this is happening, but I'm pretty certain a lot of random things are going to break when the cutover happens.