Before "open world" Warframe, I never used the Itzal - never saw the need. My go to was the Amesha. Once Tridolon hunting was introduced, I started to use the Itzal. Why? Expediency. Outside of Tridolon hunting do I use the Itzal? No.
And I suspect many others in the community have had a similar experience. Perhaps even a majority.
The Itzal became relevant because of "open world" Warframe and specifically, Tridolon hunting. Perhaps Orb fights to some extent as well. It did not suddenly become OP across all content. The Itzal hasn't changed. The content has - and only for certain specific instances.
So, Scott, give your head a bit of a shake and go back to the drawing board. What is the root of the problem here? The Itzal's Blink ability? Or the content for which it has become useful? And is this actually a problem? And why does your only solution (only publicly stated one, mind) involve deleting that usefulness? Can't you do any better than that? Here's a suggestion: Start developing content for which the other Archwings are useful, for which they might fill a particular niche. Or, conversely stated, develop content for which the Itzal's Blink ability does not give it such a stand out ability vis a vis the other archwings. You strike me as a bright lad, I'm sure you can come up with something. Something a little more nuanced and cerebral than "Nerf it!" at any rate.
Or is it against your, and by extension, the studio's design philosophy to design content for which a particular bit of gear (ex. a particular Warframe, etc.) excels above others? And should we expect more musings/rumblings about future nerfs into mediocrity in the future?