What if Smaug the dragon lived?

[Meneltarmacil]

I am still sticking to what I said earlier. Sauron, even when he had the Ring, would not be able to make a dragon do anything. If he could, he would have used them at the Battle of Dagorlad.
Oh, and another thing...

Smaug (with the help of Saurons Dol Guldur forces) could have easily destroyed the Elves of Mirkwood.

Remember the bare patch in his chest? If Bard could hit that with perfect accuracy, an elven archer could dispatch Smaug within the first 10 seconds.