I think having so few source-material reasons to have things explode- with the possible exceptions of the effects of Smaug's atttacks- would simply drive him insane.
As a result, we'd wind up with some horrible mish-mash of his past films, so Smaug would be some kind of Decepticon, Bilbo would be played by Martin Lawrence, and the city Smaug attacks would be a fortified island with all kinds of alchemical weapons on it...
how about michael bay?![]()
...what is Terry Gilliam doing these days?![]()
How about Joss Whedon?
Bilbo would have an eyepatch and Smaug would be a shapeshifter.John Carpenter
Clive Barker