There's always an adjustment period, where people have to spend time learning a new technology, and any issues with the new technology need to be resolved. The gains in productivity happen mainly after the adjustment period. But we've eliminated the periods of stability and are constantly pushing for more "innovation", which means we're in constant periods of adjustment and resolving problems, where the promise of increased productivity is never fully met.
The worst idea ever in technology is regularly scheduled updates. Innovation has never and will never happen on a schedule. This is simply greed-driven, promotion-driven, pointy-haired-boss-driven development.
Produce something new and great... but then let us all enjoy the new thing for a while. Novelty for its own sake is not productive.