Wow it looks like the CZ clone market has died.
The two companies that jwc007 listed have a limited product listing with
more polymer frames than metal frames.
I would not say it was dead, but certainly the market for DA/SA handguns has diminished considerably.
Polymer framed SA Striker fired 9mm handguns would now seem to dominate the Defensive Handgun Market.
I've not been immune to that trend either, as most of the Pistols I currently carry in my carry rotation are Polymer Framed Striker Fired Pistols.
There has been a bit of a resurgence in interest in DA/SA Handguns, but I'm not sure it's enough to change the current trend.
As for Metal vs Polymer, the Polymer Framed Pistols seem to be holding up well enough and are lighter and won't rust.
Still, I enjoy shooting my metal framed Pistols and am less concerned that they might break under use.