If you can increase the power factor of the motor, it won't waste as much electricity. If you have to add capacitors and other electronics to the fan, it is likely the fan will fail well before current fans. Increasing the the power factor is usually used for big industrial systems.
For an electric motor as small as those used on ceiling fans, I doubt that power factor correction would amount to much savings because residential meters don't measure power factor (or maybe the new Smart meters do?)