Developers who feel they shouldn't do testing are going to be less in demand

Even if it's true this will be countered by the massive increase in demand for developers, so it likely won't mean you struggle to find a job even if you don't test anything at all, so it's effectively meaningless.

I am not even sure I understand the premise... I mean, how do you not test? Maybe I have just done a bad job of being lazy all this time.

How I wish it would be true, but first companies do need to actually pay for testing efforts on the outsourcing budgets.