I have used this concept a bit differently than issued here. I believe that there are two motiviations in this world...want to and half to. A good example of this is in admissions. I have worked with many schools where the motivation to attend school is this very division. Generally our younger students are in a want to situation...they want to go out and experience school in an interest that they are passionate about. Or perhaps its just going to school and taking the next step in thier life. Either way they want to make this exciting change. They are not held to it. With this group, the want can change quickly. They may want to change schools next week or follow another interest.
Have tos, as I call them, are folks who may be stuck in a rut. They need more from life than what they are getting. They Have to make a change. That drive genereally creates a higher motiviation and desire to follow through and jump over hurtles. They dont see their "have to" as a negative. Rather, it is their way out.
This is just my 20 years in this industry speaking. Just a different view. A half to can be a positive experience...which I feel is what your presentation was ultimatelly about.