Rewrites can happen but to suggest Bunn caved to irate Emma fans and was cowed by some massive backlash is reaching. Emma is not that big or important of a character to warrant a complete 180 reversal of a storyline. Let's say he kept Emma the fall guy instead to Havok, what would of been the fallout? Would x-books sales have diminished or a massive loss of readership? I think not. And why would Emma warrant a rewrite and not other characters? Why not one for Scott or Logan or any other character perceived as being written wrongly and having a passionate, vocal fan base? So yeah rewrites can and do happen but more for overall story changes and new narrative direction. Not because a certain character's fan base was mad. Bunn did not change his story to appease Emma fans because the backlash wouldn't have amounted to anything. The x-books would have continued on as they always have.