Only way to know for sure you're safe from replacement is if your job is a necessary part of something generating revenue and your not easily replaceable. Otherwise you should assume the company won't hesitate to replace you. It's just business.
> if your job is a necessary part of something generating revenue and your not easily replaceable.
First part of this statement is clearly false.
People on the phone in a tech support company are very much necessary to generate revenue, people tending to field were very much necessary to extract the value of the fields. Draftsmen before CAD were absolutely necessary etc.
Yet technology replaced them, or is in the process of doing so.
So then, your statement simplifies to “if you want to be safe for replacement have a job that’s hard to replace” which isn’t very useful anymore.
