You can certainly encourage your employees to become lifelong learners, but you have to be willing to put your money where your mouth is. Two possibilities come to mind. One is to provide a tuition assistance benefit to employees, allowing them to take one course of their choosing. Another is to allow employees some portion of their workday to pursue a creative project of their own, a policy pioneered by MMM and used by Google, as well. It is a wonderful idea to try to effectuate lifelong learning, but I think you will find that very few businesses are going to make this a priority.
This is an interesting question. The first thing that comes to mind is that companies need to provide opportunities for workers to engage in areas that interest them. They also need to be careful to ensure that new workers invigorate older ones rather than inching them out.
I don't think that you can ensure that employees do this. I suppose that you can force them to continue to learn as long as they work for you. You can do that by requiring some amount of continuing education/in-service training. But I don't see how you are going to force your workers to become life-long learners.