If the trees are as thick as he stated, I doubt that a firebreak will offer much protection. In thick forestation, fires spread mostly above ground level. Heat rises so the hotter elements are at the top, plus the winds are typically a little stronger above ground level which helps the fire spread as well. Firebreaks do help though, for slower moving brush fires that aren't jumping tree to tree. If it were me, I think I would just let it be and take my chances but I probably would take out enough trees to give me a decent buffer around the house. You can fight mother nature but you will lose almost everytime!