Sauron's goal and the Dagor Dagorath

[Iarhen]

Ive been doing a lot of thinking about Sauron's plans on conquering M.E. and having dominion of life.

Gandalf says that if Sauron achieves victory, he will have such a definitive victory that none can see when would Sauron dominion end.

So... If Sauron gets to conquer M.E., what goal is he looking for? He knows that a similar event such as teh War of Wrath could happen, and the Valar could send a force out of Valinor to throw him down, as they did with Morgoth, and cast him into the void.

Sauron knows that such a possibility exist... Why would he risk being casted into the void?

Only 2 answers come to mind: humans and Morgoth...

Could Sauron possibly think that by achieving complete control of M.E. he would be able to summon such a great army of orcs, trolls, fell creatures and twisted men (i.e. all men... because I think that Sauron would twist men to aid him in a War of Wrath similar event and to prevent any kind of rebelion) to confront a Valinor host?

I really dont think Sauron would bet his life on this Earth on such a force... Knowing that Morgoth had a great army and was utterly defeated...

Then my only other answer comes to mind. Morgoth.

Think about this: Melkor will return when the world ends. We dont know if Melkor will end it or if he will arrive before it happens.

Could it possibly be that Sauron stayed on this M.E., escaping the judgement of the Valar for his evil deeds, with a darker goal than just merely escaping? Could Sauron be following orders, still, from Morgoth?

Just think about this. In the scenario A were Sauron conquers M.E., he could very well end the world as we know it. Enslaving all of Illuvatar's children, ending life as a free will life and ending this world, making it possible for Morgoth to return earlier?

Or in scenario B, Sauron assembles a mighty force of men, trolls, orcs, etc., to back Morgoth's attack during the Dagor Dagorath... Possibly trying to turn the scale in favor of Melkor by aiding him with an army that consists of all the twisted children of Eru?

What do you think?