Can't speak for the poster - but this is something I've seen a lot in the enterprise. I think it's a more common reaction with larger organisations because, due to their size, they tend to silo and specialise work more. So you see this pattern:

* You find $solution to make X better

* You try and sell $solution for X into $company - who refer you to the X department that does nothing else but focus on X

* Since $solution is very disruptive for department X - it tends to get rejected.

This might not just be because department X is thinking "I'll be needed less" - but it's very often a component of it.

In these situations it's often better to approach the head of department X, or the person in charge of the head of department X. They often can see the value more easily since they're more invested in results that the way things are done currently.