We are constantly bombarded with the idea that society is progressing - towards.. "something" - and change means "good", because "moving forward". Ergo, yesterday's things are inherently worse.
IMO I think that's at least part of the issue.
There's also the common notion that movement seems productive. If you are not moving, what are you doing? This effect happens on a lot of levels. Especially managers have to show they are moving needles. Any movement is better than no movement.
People (rightly or wrongly) believe the new technology is better suited to their problems.