Ummm no, there are a few things I disagree with here. The ignition temperature of wood is quite variable depending on the type of wood and the moisture content, but even under ideal conditions wood won't catch on fire until the temperature is well over several hundred degrees. I've been successful in the past using an undertank heater to heat wooden cages, it just takes a lot longer for it to heat up.
Many people, myself included have very successfully housed multiple snakes together without any problems whatsoever, cannabalism in ball pythons is EXTREMELY rare. Why is it that everyone seems to use that as an example of why not to house animals together? I prefer not to house multiple snakes together myself, but it has NOTHING to do with cannabalism.