I think you will find that the Fire Brigades always provided cover for life-threatening fires (they certainly did in my FRESCO area), using it as
PR - 'look at us, we are on strike but still save the day!!!!'
Hence the only real risk is to the insurance companies that foot the bill for unoccupied property burning down.
IMHO, public support for firefighters has dropped to such a level that they would be barking to try it again - it is no longer seen as a fight to be paid fairly, it is greed that is putting peoples' lives and property at risk. I believe that most firefighters were so embarrassed over the last farce that it will not happen again for some time, especially if the government sticks to its guns that there is no alternative from the military. It is just such a shame that the FBU officials were permitted to drag down the reputation of a group of people who are prepared to put their lives on the line (albeit very, very infrequently...)