Sadly, in an aircraft fire where the cabin is involved, survival rates are very low for those who cannot self extricate down a slide or aren't near an exit. Cabin is a Class A fire environment in and of itself, even without Class B accelerants, and once even a small fire starts, the heat build is so rapid that items begin burning quick. Interior temps rapidly go from 1500+ degrees near the ceiling, to about 100+ at the floor, and the toxic gases build and descend to the floor so rapidly, that survival time just due to these gases is very short. Granted, a fire of this intensity, it will crown very quickly, around 90 seconds, through the roof of the aircraft and self ventilate, but that doesn't help those onboard.
Rescue of persons trapped in this environment is very tough, if not nearly impossible. We were running 4 person interior teams, 2 on handline followed by 2 rescue. Inside the aircraft, after making entry through the left overwing exit, visibility was about 6 inches, even with the beam of the flashlight, until reaching the fire area. Still, we were only able to make rescue of 4 persons on the exit row and about one or two rows each way, before being about 40% air remaining and bushed from the effort of laddering the wing, hauling the line up there, etc. The hose team had more air and could continue further inside, but they are fighting fire, not rescuing necessarily. This doesn't take into account the real-world of aisles blocked with persons and bodies, jam-ups near exits, maneuvering of hoselines in the interior area, etc. So realistically, in a cabin fire scenario with a fire starting and not controlled, unless you get out yourself; chances of being rescued from anywhere other than about a few rows from an exit are slim. And remember, with the majority of ARFF departments, manning is fairly low with some trucks only having 1 crewmember onboard, depending on the airport.
Pax have to conted with the toxic gases far before the thermal nature of the fire ever gets to them. So you'll choke to death long before you ever burn to death. It's just not an environment conducive to survival. With water use in the cabin only (no foam is used if possible), there's always the steam component which we try to avoid, but can't always be avoided.
All this is even after the hazards of making entry to the aircraft. If it's an older airliner, and I'm entering through one of the main doors that is not yet opened, I have to pop the door about 6 inches, reach in and feel for the girt bar, press the tab (Boeing) or push the horizontal release (McD) and disarm the slide so I don't get it in the face when on a ladder [if the slide is deemed to not be necessary], and go from there. At least the new auto doors on the 767/A330, etc, when the external handle is manipulated to open the door, the slide automatically disarms.