Let's say it looked like they would win. Everyone proved faithful and the battle is looking good. I don't think Morgoth would at this point sit back and watch it happen. I could see two things happening:
A) He himself doesn't have anymore orcs/balrogs etc. left to fight, so he himself goes. I doubt if the Elves, Men, etc. could stand against the might of Morgoth himself. This I see as the less likely of the two.
B) The Elves, Men, etc. prove victorious. Morgoth admits defeat for that day, but waits and rebuilds his strength to an even mightier force than before and comes back out with his larger armies and utterly destroys the people. This one, I think is comparable to Sauron, matter of the Ring aside. He was defeated in the Last Alliance, but he waited and took form again, rebuilt his armies, and set out to destroy the world, and would have won had it not been for the Ring.
Either way, Morgoth's victory is inevitible, and the Elves' war on him impossible without the aid of the Valar.
If (B) were to be the one that occured, I think some of the Elves, like Fëanor's sons, would probably try to get the Silmarils back, but I think it would probably be hopeless. Morgoth is entirely too powerful for them to get them. They would have died in the attempt.
I agree the battle was inevitible and also necessary for them to have any hope of surviving. But it was hopeless. They never really had a chance against a foe so great.
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