Will we ever see a metal Glow Plug to replace the fragile ceramic one?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

I doubt it. Those things get to 800 degrees on startup, and stay on for up to 2 1/2 minutes.
Think of the space shuttle being all metal on re-entry.

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2006 Sport CRD

Could the Aztecs have known, that in 2012 after a 4 year experiment, our country would cease to exist?

Pyrometer probes are metal, and all of the other vehicles I owned with glow plugs were metal. 800 degrees is not all that hot for metal.

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2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Proudly supporting CRD vendors, and their development of quality parts and accessories.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

I guess not. Pizza ovens get that hot, except they don't have sensitive electrical component in there. The temp probes are usually tungsten or some other alloy. Probably comes down to cost more than anything, although I think a ceramic plug is is more heat resistant and less prone to failure.

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2006 Sport CRD

Could the Aztecs have known, that in 2012 after a 4 year experiment, our country would cease to exist?