The new era it is not about to start. It has already started. Theories about motivation are falling down. Why? Because just few things work and grow with rewards, carrots and sticks. We are not donkeys, after all.
The left side of the brain is leading at moment. It's not possible to evolve reproducing past patterns anymore. We need to produce innovation, creativity, solutions, alternatives, new ways of dealing. In recent past, we had basicaly beaurocracy, tasks, procedures, schedules, timetables, fear, threats. Now we more and more deal with passion, ideas, autonomy, purpose, significance or meaning. And rewards, carrots and sticks don't work... really. They are now nothing but an illusion.
Dan Pink explains this very well in his book, «Drive». Motivation 1.0; Motivation 2.0 and Motivation 3.0. What means these?
Motivation 1.0 it's about survival. For example, in our very early days, our behavior was lead by the need of survival, running from predators, etc.
Motivation 2.0 arouse when the complexity of societies grew. And then we start to operating like avoiding punishments and to seek rewards. It is linked to external desires and reality.
Motivation 3.0 drives now our behaviors. We need an intrinsic satisfaction, significance, purpose, mastery and engagement. Humans, by nature, seek purpose.
If you want to motivate your team give it a purpose, a meaning. Engage people with autonomy, allow people to reach mastery. Need something more? Please read the book. «Drive». You will not regret I assure.