If they'll do it with flagships then there's no guarantee Recon Tanto, SRK or even Warcraft Tanto are safe from same fate.
For all we know maybe SK-5 models are already out of production or Cold Steel is using old stock of SK-5 for them, and new one will be 4034.
SK-5 is by no means high end steel, but is tough and holds a decen edge while being easy to resharpen.
In comparsion to that, low end stainless like 4034 either won't hold an edge or will be prone to chipping. I won't even mention rolling issues if left soft. And when we come to resharpening (which you'll be doing a lot considering edge holding of 4034) it has very stubborn burr and likes to form wire edge.