Journeyed there and back again
I remember some years ago there was this whole discussion about "Rothfuss doesn't owe anyone anything". He was defended in this by Sanderson (if I remember correctly he wrote a substantial blog post about it called 'Rothfuss is not your b*tch').
Back then already a lot of people felt that indeed, yes: he did owe his readers (and his publisher/editor) something. There was this magnificent promise about a trilogy, which indeed he claimed was already totally finished when the first book was released! Fans have been waiting with blue balls ever since. I now regret having read the first 2 books altogether to be honest, especially so because I -and millions with me- made the guy rich as can be.
A lot of people defend him by denying this, and saying there is no "promise." To them I say: if Rothfuss or his publisher were to have said back in 2007 that fans would have to wait until 2011 for the sequel, and that there would be no concluding Book 3 until at least 2020 - a full 13 years after the first book - would the fans still have bought his book? Maybe a few, but certainly not 10 million+ of them.