with different colors from season to season, or will they stop making this entirely at some point?
It's hard to say.
According to the European SAs, there won't be permanent, they already stopped making the black with both hardwares. I called whole Europe about a black with gold or silver hardawre and there's none left and won't be coming in anytime soon. You can be lucky in the US. I just have a grey reissue on hold for me and I just need to pay for it and I'll go for it if I can't find a black at NM in 226 today or better a wonderful pf member is helping me with it.
I think the reissue is Karl Lagerfeld's ode to Madame Chanel, so I'm guessing it'll be around as long as Kaiser Karl is at the helm.