This article seems to have been written by someone who doesn't do windows administration, and is looking from the outside in, not understanding its power nor how it has vastly changed administration in the past decade. The claim that powershell has languished is a joke. Real windows admins after about 10-15 minutes of fiddling, shouted for joy and immediately burned all their VBS books. Warmed by the pire of the past they saddled up to that magical blue window and changed their work lives forever.
If a windows admin isn't using powershell... move along, they're not a windows admin, they're a novice or a hobbyist, or someone at a small company that does 37 other things in addition to adding user accounts twice a month to their Small Business Edition 2008R2 server that also has their GP and Exchange instance running on it (tho, that's the guy that should be making the most of PS)
Powershell IS windows administration. To claim otherwise is intentional ignorance. Adding SSH is fantastic, and adding BASH will make process management in multi OS shops very nice (depending on how deep you can get with whatever bash commands are available) but powershell is going to remain the heavy lifter, the every day use script language that flipped windows management on its ear. It is a glorious and easy to use script language, one that will continue to expand its presence, not diminish.