Training raises competence and usually raises usage. People try the tool, some keep using it, and a usage curve appears that looks like progress. What it measures is individual experimentation, not a change in how the organization works.
The gap is structural, not motivational. If the workflow, the approval chain, the quality expectations and the performance measures all assume the previous way of working, then using AI creates extra effort for the person and no visible benefit for the team. Rational people stop.
This is why pilots so often succeed and change nothing. A pilot suspends the normal conditions: attention, support, freedom to experiment. Return the work to its usual environment without changing that environment, and the behavior reverts with it.