Imo support Wiz is highly underated and i enjoy playing it from time to time in hc greater rifts. So far i haven't gotten a single complain, and its viable as solo support or in combination with any other support - preferably with a barb.
Especially when running with vyr wizards I think supportwiz outperforms monks by far due to the fact that the healing of the monk is often not needed, and its more important to control the mobs properly which is easier with a support wizard. However, I don't think the spec you posted is the most valuable support spec there is. I will post my own spec tonight, if you are interested i can link it to you