Not necessarily. Demand may be much higher than available supply right now. Tech companies will continue to compete, requiring spending on developers to remain competitive. Software is unlike manufacturing, in that the output is a service, not a widget. Worker productivity in general has not decreased the demand for full work weeks, despite projections in the early 20th century to the contrary. Of course, it is possible that fewer developers would be needed, but I don't think it's likely, yet.