Has there been a significant drop in lung cancer rates among non smokers since indoor smoking bans began to take effect?

I don't know the answer to your question but there has been a huge increase in me enjoying going to bars.

How much of the original motivation was to reduce second hand smoke? I think that it reduces the number of total smokers, improving health directly rather than indirectly. There is also probably an economic benefit because people go out more. I don't have any data or sources though so someone else can probably be more helpful.

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Lung cancer is rarer in non-smokers to begin with. (Only 1 in 10 lung cancers are in non-smokers). Additionally, the biggest risk for lung cancer in non-smokers is household second-hand smoke. That is, exposure from smokers in the home, not like from occasionally going out, etc. But like lohborn said, that wasn't really the goal of smoking bans.