The Thalmor seek to unmake Nirn, but my thought is, how would Dragons respond to this notion? Would they be in support of this action? Or perhaps against it?

I don't think the Dragons care much about politics, since they haven't apparently made an exception of the Thalmor.

The Dragons seem pretty confident that they are going to steamroll Tamriel and whatever gets in the way, gets in their mouth. Thalmor, Stormcloak, Imperial, ain't no matter what's being served for breakfast. The Dragons serve only themselves and don't bother with others' plans, even if they coincide with their own.

You misunderstand me. I don't mean their political aims. I'm referring to the Thalmor seeking to unmake the world, reverting everyone into soul forms or whatever'd happen.

I've always felt that it was just Alduin's job to end the Kalpa,the rest of the dragons want domination and Alduin himself strayed from his path and wanted to rule Nirn or atleast tamriel.
The Thalmor don't just want to end the current world but end the cycles as well..Getting back to the dawn era and to their sprit form.
I'd say the dragons if made aware of this would tak offense because they want to rule the world,But as they are outside of linear time,They wouldn't really be affected by it and continue to exist..So they would probably attack the thalmor but not out of self defence but because of the want for power.

I know what you mean. What I mean is that the dragons don't care about anything Men or Mer do, whatever it is. I don't think they even know about the Thalmor's ultimate plans and if they did I don't think they would care. The Dragons act for themselves, and themselves only. They don't share victories and they sure won't help another force complete their plans, even if they are so similar.

Thalmor soldiers in the Embassy are heard wondering about defending the embassy against a Dragon IIRC, and in general it's hinted that the Dragons are a problem to the Thalmor just like to anyone else. If the Dragons would want to help the Thalmor in any way, we'd know about it.

Wait, so because of their position on the currents of time, they'd still exist in form? That just sounds nuts. (Not ridiculing, just trying to grasp it)

They are parts of akatosh,in essecnce they are part of time and hence unaffected by it,So they'd not be affected by the uncoiling of the time dragon.
Dragons in many ways are stray parts of time.

Ah, so in a vague sense, dragons are akin to Elder Scrolls, being a part of the world, but not?

Well seeing as at the beginning of the game, all or most of the dragons support Alduin, who pretty much has the same goal, one of a few things could be happening:

• The Dragons also want to unmake the world and therefore work alongside the Thalmor
  
• The Thalmor and the Dragons have the same goal, and are therefore rivals, but aren't really hindering each other (i.e. both rival groups are working to end Mundus but they aren't really fighting each other, this is probably the most dangerous outcome seeing as it could potentially bring the end of the world twice as fast)
  
• The Thalmor and Dragons fight each other in a bloody war, and neither group ends up fulfilling their goal because they are so devastated after the war

Unless the Dragonborn is a High Elf Thalmor supporter, and he possesses the Bend Will shout.

Just not as omniscient or as powerful.

The Dragons way of unmaking leads to the birth of another,But the Thalmor way end it forever,They wouldn't really work together Neither would the Dragons raise an army against the thalmor,The Thalmor would probably be another story,They'd probably attack the dragons,without trying to understand them.