In your case, you obviously have the money, so GAS isn't an issue. But ask yourself, with an Axe FX and a Kemper in your arsenal, you are going on and on about the need for an even better Profiler/modeller?
Personally, because I have both units, I don't necessarily have a dog in the fight, though it's because I have both units that I can see some of the shortcomings of the KPA. Just because I think the KPA can be improved doesn't mean I don't appreciate it for what it is. However, the entire reason the KPA exists is because someone saw an opportunity to improve on the technology that came before it.
Seriously, that is probably better gear right there than Vai or Petrucci ot The Edge had when they were writing killer albums.
Not a fan of either, so I'm not sure what they were using when writing their most popular stuff, but you can bet the engineer and studio involved in their recordings had a lot to do with the finished product.
And that's just my point. Call it simplifying your setup or whatever. But if you have top shelf gear and are then going on and on about how it could be better, you need to introspect whether your passion is about the music, or about the gear.
Envisioning areas where technology can be improved while appreciating what you currently have are not mutually exclusive positions. Improvement drives innovation. It's the reason top-tier modelers are as feature rich and sound as good as they do today. Personally, I'm all for it, but again, it doesn't mean I don't appreciate what I have.
Also, you did see the picture of Edge's rig, right? It is not feasible with any single piece of gear afaik, heck he has three Axe FXes in there, with one as a backup.
It really depends on why he needs three Axe-Fx II's. I wouldn't doubt if some of that is related to gapless switching, and in that regard, the Axe-Fx III is much more capable.
In that regard, it just seems like wishful thinking that even if there is a Kemper 2, Alienator's tone will be like The Edge's.
Maybe not, but he might be able to get closer, and if that's important to him and he has the money, well, I say more power to him.
Indeed, it seems more about having it all served on a plate (without tweaking) rather than some urgent need to construct some sound in his head.
I can only speak from my own experience. Personally, I don't really need things served to me on a plate(though I wouldn't balk); however, there are some sounds I can't duplicate in the Kemper, thus the need for the Axe-Fx III. Further, even if I could create those sounds with the KPA, there's the question of how much time and effort I'd have to spend doing it, and that's where features and flexibility can be important to efficiency and workflow. I mean, I can make a POD XT sound pretty good, but I'd have to spend a lot more time doing it vs. the Axe-Fx II or III, and it still wouldn't sound on par with the Axe-Fx III. For me, improving efficiency and workflow doesn't necessarily mean you need things handed to you on a silver platter. It just makes the process of actually getting from point A to point B easier, which, in the end, can help you focus on what's important; the music.