I largely credit my success at work to the tools for working with my mind imparted by my upbringing and continued practice. However, mindfulness is just one of those tools.
There are forms of meditation that build upon mindfulness that I would argue can be very helpful to motivation. To put it another way, once you are able to focus your mind on the present moment, there are other things you can focus it on.
For instance, if I've got a meeting coming up where I need to partner with people with whom I know I usually have a combative relationship, engaging in a compassion meditation, such as Tonglen, motivates me to see their problems and want to help solve them.
Mindfulness itself is wonderful, but it is among the most basic of techniques for training your mind. It is remarkably comparable to physical exercise, where a basic level of activity yields amazing results for your overall health, but must be accompanied by specific training if you want to dramatically change your physical capabilities.