Yes I think there is a sense of exhaustion, although once I've seen the final instalment (I suppose I will at some point) I wouldn't mind writing how perhaps they could have taken their rather 'jazzed up' take on the story while remaining more true to the source material.
Funnily enough I'm currently watching last year's QI Christmas Special and Stephen Fry was discussing the fictional 'Rich List.' Number one (Smaug) is teased out as "played by Benedict Cumberbatch" and Stephen Fry says "Sixty-two billion dollars worth of gold he sits upon, until of course he - well, I'm not going to tell you the ending." It's just a little joke of course, but it's sad that we can't even assume that people have read and know the ending of
The Hobbit anymore
Then again the other day I was speaking to a well-educated artistic and professional person who'd never heard of Lord Byron so I suppose you can never be sure of what people know these days.