Throughout the history of computing the number of developers has been climbing as has the demand. In that time the ability of 1 developer has increased, on average, to be able to accomplish more in the same amount of time/effort. Will the industry change? Undoubtedly, but automated out of a job? I doubt it. More companies will find it financially viable to hire a full-time developer who can do what would overwhelm a single person in the past, or hire a small team that can execute at the level of a much larger team.