It’s a paradox that those who help make themselves replaceable at work actually become more valuable instead of irrelevant. People who can train and delegate to others multiply their impact instead of diminishing it. I’d welcome someone who worked themselves out of a job and gladly find other challenges for them to conquer.
I think it’s important to explicitly communicate the value that delegators and innovators provide. You want people who expand their roles and empower others instead of hoarding information, resisting technological improvements, or insisting on doing things “the way they’ve always been done.”
Celebrate those who find a better way — especially if it means that their role changes along with it. Those are the people who can help you move forward.