You can't be certain a single toss is going to capture all the angles you need (inside a closet, under the covers of a bed, etc). It also still gives you a static 'snapshot' of the space. You really need a dynamic view to get an idea of what the fire is doing, distinguish victims from other blobby heat signatures, etc.

The UI would be tricky as well... Consider the conditions the user is operating in... Extremely poor visibility (no hi-res display (potentially solved by project on the facepiece directly)), bulky gloves (no touch interface), heavy gear (every extra pound matters), significantly restricted movement (tough to throw the thing in the first place).

I think there's a lot of progress to be made in this field in the near future, but I'm not sure this is it... Things like helment mounted TICs, and HUDs projected directly on the SCBA facepiece seem like they would be far more useable, and easy to implement..