Its going to be extremely hard to update computers and other devices for this
Not really
hard - just tedious and time consuming.
We should also move to Base 10 Time while we are changing...
100 seconds in a minute
100 minutes in an hour
10 hours in a day
Just 13,600 bonus seconds

Let's include the US in the change this time.
What about those devices who aren't connected to internet? Can image how much time It'll take to update them manually?