On the other hand I remember having once been proactively rebooked by KL while still airborne after a small delay on the first leg. I still managed to be at the gate "on time" for the second leg (they were closing the gate but it was not closed yet) but, as I had already been rebooked they could not accept me on the flight - eventhough that was the last flight of the day to CDG.
Not a good strategy for KL but I was happy to be offered a compensation that was about twice the cost of my segment run (yes, at that time that was still a "segment" run
) and a free night in a nice hotel!