wildfires are a cyclic successive event, they are ecosystem scale events.

this idea has been floated for a long time now, and the missing piece is that native indiginous peoples used fire as a controlled landscape tool, to create nitches for certain species they wanted, and to have fire breaks in case of extream dry weather occuring, also there were many more beavers and the flood zones they created acting as beariers, plus there was at most 10% of todays human population, no power lines or other such ignition sources, and if true, a lot less lightning, and it was cooler and wetter.....so definitly more factors than just an increased amount of brush and other tinder due to fire supression.