Lets see,

1. they cost more (twice as much as a polymer gun)
2. they weigh more
3. they do nothing more

I always chuckle a little at the "Glock marketing killed the 3rd gen S&W" theory. I think progress killed the 3rd gen S&Ws. The majority of the shooting public has lost interest in the double/single action, exposed hammer all metal pistol. The consumer voted with their wallets, and S&W 3rd gen pistols lost. Painful for many here, the truth none the less.