Re. dust issue.
This more of a problem when swapping lenses IMHO. One might be able to go into a tent or other protected place to get way from blowing dust to change film or cards, but if one needs to change to a different focal length etc. during a shoot.....
With film, one tends to use multiple bodies to avoid having to re-load 'in the environment'. This includes pouring rain (common in coastal AK). I recall the closest I have been to bears (late 80’s - Kodiak Is.) - a sow with 3 cubs and each had a salmon in its mouth - only about 20 feet away! It was dark and pouring down rain - I was using a Nikonos 3 with 80mm lens, 400 asa film. When I ran out of film after the second shot I was unwilling to open it up to re-load! I was standing next to a canoe (it grounded as it was very shallow) and it was extremely wet - a formula for disaster to have to re-load. The pix were lousy due to the fast film and grey conditions too. A P&S digi might be good for such a situation (also potential for beefing up colors) so long as one had a good supply of batteries as this was at one of the powerless locations I referred to above.
Tom