Developing skills related to AI puts you in a better position to make AI go well. At least for me, this outweighs the other concerns that you’ve mentioned.
Note: This doesn’t mean that you should take a job that advances fundamental AI capabilities. This would probably be net-negative as things are already moving far too fast for society to adapt. But it sounds like you’re more considering jobs related to AI applications, so I’d say to go for it.
I believe this is likely a smaller model rather than a bigger model so I wouldn’t take this as evidence that gains from scaling have plateaued.