I don’t think DA/SA is going anywhere, I just think a lot of manufacturers already have a great offering in that format. The USP/P30, Sig’s many offerings, CZ has many offerings, the Beretta, etc.
I also think the surge in popularity with striker fired guns is due to a number of factors. The first is price, they’re likely cheaper or produce and in most cases cheaper for the consumer. Many folks don’t consider a couple hundred bucks (in some cases) a trivial amount and will take the cheaper option.
Another reason is the simple manual of arms. Sure it’s easy for people who love to shoot to look down our noses at people who can’t shoot the first shot on a DA/SA well or folks who have troubling remembering how to work a manual safety, but quite frankly most people don’t really care that much. We also like to turn our noses up at mushy triggers, but again, most folks couldn’t hardly tell the difference.
Most non gun nuts just want to be able to hit a paper plate at 7 yards and have something easy to use and reliable. Nothing wrong with that, even if it’s not what we as a group tend to do. To add to that, I’d imagine it’s easier to train large groups (LEO’s, military) if the operation is simpler. Those groups likely don’t spend a lot of time mastering their weapons or putting ammo down range, as a whole anyway and anything they can do to streamline the process only makes it easier and more efficient. Cost is a huge factor with those groups too.
So while I don’t think they’re going anywhere, I do think the days of police departments, government agencies and military issuing them are likely dwindling.