There would be several battles. In the beginning there would be a flashback of Smaug kicking ass and doing whatever he wanted as told by the head Dwarf (forgot his hame). Bilbo did kill some giant spiders. Gandalf intervened on one part. The final battle against Smaug will be awesome. Finally the massive battle of 4 (maybe 5) armies battling it out for Smaug's treasure. There's plenty of battles to expand upon for action.
Exactly. Smaug is an awesome villain in The Hobbit. However, had Smaug been a Great Wyrm the fatal arrow shot by Bard would've just bounced off. 😂 Or it wouldn't have done much more than hurt him slightly. 😆 That would've pissed off Smaug even further then he already was. 😈 Personally, I think it was very anti-climatic and a (lamest) joke that Smaug was killed by just ONE arrow. 😘