"Decimation" is to reduce by a tenth (and typically those being reduced would be forced to decide who to lose), so a poor comparison to "losing half your staff". If you're going to mention its Roman origins, then these details matter.

And if it's going to get easier and easier for my work to be performed by AI, then what does it mean for me to "keep up"? Do I just need to create more slop than anyone else?

Excellent consideration, probably. Sounds like a lot to do for very little in return. I'll leave with this, a sort of sick joke given context:

    Quit when the work is done

Fortunately my job is not based on generating plausible-sounding bs, so I should be safe.

Hear, hear. Wish you the best! There's a whole list of other silly games to avoid, unfortunately. Namely, "up or out".

For instance, I want to engineer [more]. Closer to management or sales due to scope creep. At this rate, by career-end, I'll be operating a small country by myself.