How did the fire extinguisher/sprinkler system not put out the fire on the altar? There's an Issur of לא תכבה for one to extinguish the fire. More importantly, when the 3rd Beis Hamikdash is rebuilt, will there be any fire extinguishers installed? Emergency exits? Any sprinkler systems?
The altars are all outdoors. Where would you hang the fire extinguishers?
As for sprinklers - they had that already. They're called Cohanim. They sprinkle blood. I've never experimented with this, myself, but, I'd imagine that blood is good at extinguishing fires, unless you're angry when you do it. Then, the blood would boil first.
The 3rd Bet Hamikdash would encounter the same arrangement, I would assume.
As for emergency exits - why would any type of emergency occur in the Bet Hamikdash? This is the place where God is present and his protection is constantly there. If one doesn't have full faith in God while in the Bet Hamikdash, then, something is drastically wrong with that person.