If your perspective of ML was based solely on the comments in this thread you'd think there's 0 opportunity in the field -- obviously not true.
The people who comment on these kinds of posts tend to always be incredibly cynical, and I am not sure why. They offer a limited perspective on the industry and you should not let it discourage you from your desire to learn and become an ML engineer. If I were an undergraduate CS student interested in ML/DS I would start by taking an intro course for ML and creating a side project you're proud of.
