It is certainly comparatively easy to self driving cars. But that's the point: while we haven't solved level 5 autonomy yet, we do seem to be solving these lower level problems at or above the same skill level as trained professionals, and the amount of problems we solve with machine learning technology appears to be increasing at an exponential rate. It's logical to extrapolate from here that AI will be able to solve even harder problems in the future, including those our best researchers still haven't figured out.
A job at its core is applied problem solving. When AI services and physical robots can solve every problem in a better way than humans against every metric possible, there won't really be a need for humans in the workforce.