I'd argue in favour of a Reigns turn for one simple reason: The guy should have a heel run before becoming the company's top face. It would be foolish to waste the opportunity they have now to do something they won't be able to do in a year or two. Something that would, as well, better prepare him for any future heel work much further down the line AND something that would temporarily redirect him, providing him with a much broader base of experience than simply progressing up and up and up as a face without ever changing, growing or evolving.Just because? How about for my fucking entertainment?
And why exactly does it make sense for Reigns to turn because Rollins is hurt and the circumstances but not Ambrose?