I never really understood why that last scene has to continue with the same characters, personally. Why couldn't the last scene be the children or grandkids completely grown up, spending more time reflecting on how things changed for their family than covering the "technology of today"?
It could be done in a way that would keep the scene from becoming dated fairly easy, it would seem.
Instead of "laser disks" and "car phones" and "voice response ovens", it could be about looking back. I think it's the only way Disney would update that scene, because technology just moves too fast these days to do much else.
Plus, that would help explain the huge gap between scenes 3 and 4... To make it the next generation looking back, as opposed to Father... Who not only has a christmas tree whose lights respond to his voice, but has also apparently stumbled upon the secret of everlasting life. :lookaroun