As somebody who owns two Glocks and have witnessed the M&P, XD[M], PPQ, whatever come into popularity off the Glock's success (not saying Glock was the first polymer gun, but it was the first to get such recognition) I have heard people complain that metal frame DA/SA guns are becoming obsolete.
I don't think that polymer guns are a "fad", I think they are here to stay. But I also don't think DA/SA guns, or guns with external safeties, are going anywhere.
Any time a "new and improved" gun comes out, people flock to it, gawk over it, say it's the best, and then excitement tapers off.
Look at the 1911, every time a new type of gun came out people must have been drooling over the higher magazine capacity, light weight, design, etc. but still after 100 years people, myself included, can't help but buy an all-steel, single-action, manual safety gun that requires hand fitting.
So what's this got to do with the 92FS? People complain about it and want the latest and greatest. But the 92SFS hasn't gone anywhere. It's still heavy, it's still DA/SA, it still lacks a super duper rail (unless you get a 92A1 or M9A1) and yet it's still churning along. And it may outlast the production of some polymer guns.
Sometimes you just don't mess with success.
I can also take the P226 as an example. Again it's big, it's heavy and people don't want to drop a thousand bucks on it. You could get a super-duper great new polymer gun for so much cheaper that seems so much more advanced, right? I thought so too but every time I read up on a gun I thought was the future, it still had little issues that weren't apparent on the tried and true design. I can't really quantify it but you have to fire and handle and own one to understand. But you may have a different opinion.
I hear people complain about DA/SA. In Canada, unless you compete, this is a moot point. When are you ever decocking the thing at the range? But the Beretta allows you to use the safety as a decocker and also as a safety, so you can keep it OFF safe and it's still safe.
There are some alternative models I wish that the 92FS would come in. I wish it came in the exact same configuration with a steel frame for high volume shooting.