It will help you to look for a job in, say, a trainer or a teacher in some audio or music school or course, perhaps? Pro Tools seems to be the standard DAW application in most of the sound education institutions. Hard pressed to find one that teaches using SONAR or Cubase or other similar DAWs.
Besides, you never know what new things you can learn from these course, even IF you know ProTools pretty darn well already.
Apart from that, experience and personal know-hows will carry you through. In those cases, the experience you have over what DAW matters less. All that matters is the end product.