It isn't safe in the absolute sense, but it is the safest: as soon as AIs can program, they can automate whatever else is left themselves, probably fairly quickly.
This is not necessarily the case. Humans are machines that can do programming. And yet there are many many tasks for which we are unable to design machines to automate. Technology takes time to progress, AI or no AI.
That said, strong AI is so difficult, and we are so far away from it, that it is likely that by the time it happens we will have automated everything else already.
I actually think social work will be the safest job. In a world filled with robots, people will want to talk to real people :)
