As for the Dwemer I have my own theory,In plain Morrowind when they talked about them vanishing all at once it seemed,they had realised they were out gunned they had figured out how to manipulate time and matter,so they went off to another place or time waiting for the right time to strike(don't be surprised if we see these critters pop up again.)But the ones in Mournhold it seems burnt themselves up messing with the weather contraption as evedent in the ash piles.The dwemer robots and flying machines were also present in Morrowind,not just tribunal.As far as the gods destoying them I just don't buy.If you have played both Morrowind and Oblivion it is appearent the gods do not have much power.They need mortals to thier duties for them.The dwemer realised this and sought to make the gods irrelevent by overcoming them with logic and perhaps succeeding.I mean think about it how powerful would a god be if mortals had to fight thier battles and power them,it should be the other way around as a father I would never ask my children to fight my fights.Anyway I have tons of ideas on things pertaining to the dwemers.But the gods destroying them I just can't see that one.
The clues you are looking for are here:
"Ah. I will tell you the truth, because you will believe none of it. The Brass God is Anumidum, the Prime Gestalt. He is also called the divine skin. He was meant to be used many times by our kind to transcend the Gray Maybe.
The first to see him was the Shop Foremer, Kagrenac of Vvardenfell, the wisest of the tonal architects [Mechanists - MN] Do not think as others do that Kagrenac created the Anumidum for petty motivations, such as a refutation of the gods. Kagrenac was devoted to his people, and the Dwarves, despite what you may have read, were a pious lot-he would not have sacrificed so many of their golden souls to create Anumidum's metal body if it were all in the name of grand theater. Kagrenac had even built the tools needed to construct a Mantella, the Crux of Transcendence. But, by then, and for a long time coming, the Doom of the Dwarves marched upon the Mountain and they were removed from this world."- http://www.imperial-library.info/interviews/skelm.shtml
The airship (assuming you mean the one from Bloodmoon, or there exist flying thingies in Morrowind that I am not aware of) isn't really a dwemer machine, is it? It was built from dwemer parts, yes, but it was it really build after dwemer design? I thought that breton guy just fiddled a little with the cogs and cylinders and what not and well, the rest is history
It wasn't, yes. Ironically, the "airship" only worked with massive levitation enchantments, the steam did not have an actual effect (other than for show). However, the Dwemer actually had airships, as the http://www.imperial-library.info/dwemer/guide.shtml shows.