I can't comment on the science of what causes the fires as it is way beyond my knowledge of these things. But for those of us who have had it happen (the norcold 1200 meltdown) it is not an easily forgettable site when you get to see all the charred wood etc. Unfortunately a residential is not a practical resolution for everyone because of factors like budget, space for additional batteries, solar and inverter, install etc. I doubt there is any financial benefit either way if replacing with a residential as by the time the inverter, extra batteries and solar are installed I suspect the cost would be comparable. But for those who are willing to jump through the hoops of getting it done there are some nice benefits of the residential. Close to double the space in a unit with comparable frontal area, excellent performance, no worries of being off level on overnighters etc. For those who don't dry camp much the financial benefits of switching to residential are excellent as no solar needs to be added and existing battery capacity will be sufficient for the little bit of dry camping they do. For those of us who dry camp a lot obviously the investment is probably about 1500-1800 higher. For us it is well worth it but I can see where it wouldn't be everybodys thing.
We have two motorhomes. One is already converted. When our little C's fridge quits it will be replaced with a compressor unit as well. It is already setup with inverter, extra battery capacity and lots of solar. The upgrade to a compressor unit will probably cost under a 1000 bucks. We almost never have any kind of service when we use this rig but the power requirements of the 9 cubic foot and smaller compressor models are minimal in comparison to what a good solar array produces. It simply wouldn't make sense to replace the dometic with another gas burner. The compressor fridge that replaces the dometic 6 cubic foot is a 9 cubic foot. It is a no brainer.