Alright, I admit I should have used the title "Gun-Using Archetypes", but to me, an archetype is almost a separate class if it heavily modifies certain aspects of the class (such as the Spellslinger using the gun as a focus).
On the note of nitpicking: Nimon, would you please stop going on about Numeria! I was only asking a question, not starting a debate about what should and should not be in the books (that is what editors are for)! So it is one picture of a Wild Wild West Mecha Spider with Machine Guns, those things are EPIC level at least! If you want a place for them to appear, consider that most of that tech is of artifact-level rarity that would be more appropriate in the PF equivalent of an Epic Level Handbook, or the Secrets of Xendric supplement from Eberron.
Concerning the banning of the archetypes: thank you all. I was actually curious if there had been a balance issue with the classes, if they were deemed "over powered", or what ever else. Since many of you pointed out that it didn't fit the image of the world, I am willing to accept that. What's important is that the world's evolving, and that (hopefully) the archetypes will be taken off the ban list because the culture of Golarion has caught up with it.
Until then, I will wait patiently and build on my own campaign ideas.