One way to avoid workaholism is by recognizing that true work-life blend begins in one particular direction: from self to work. Work may come to inform the self over time, but work must first and foremost be designed by the individual if we are to experience meaning and flow, the bedrocks of lasting happiness.
I also see a worrisome trend afoot. Increasingly, mindfulness is being equated with stress reduction or learning how to center under pressure to enhance performance. This is cause for alarm. The intention of mindfulness is not to make us more "chill" with the insanities and inanities of our post-modern lives.