Itzal does not need a nerf, and it's not a good idea to give us more options by making others obsolete.
I agree with a lot of the responses here - I do think Itzal is meta just because it's so effective in open world nodes, in the same vein that's not really a bad thing. I just think other options (K-drive/AW) need to be brought made more appealing with their own strengths.
Currently Archwing is just used to get from point A to point B - Itzal does that very effectively, and there's nothing else that comes close in that regard. But what if DE gave us reasons to use archwings where speed isn't as much of a factor?
The Flying Eidolon comes to mind, in this regard it might be a better idea to bring a high damage/utility archwing instead of a go-fast archwing.
As far as K-drives go, I think overall they are hurting, and need buffs to mobility and utility - they need to be able to instantly and easily overcome terrain obstacles like mountains in order to compete with archwings. Being able to use weapons and possibly even one handed Warframe abilities would make K-drive much more appealing than they are now.