Japanese automaker Nissan (NSANY) finds itself at a crossroads. Nissan was poised to participate in a megamerger with rival Honda (HMC), and it was a huge development when the talks were revealed late last year. This was not just some run-of-the-mill consolidation — this would have been like General Motors (GM) and Ford (F) joining forces into one behemoth. Both brands enjoy their own cultures and reputations, and this may have led to the deal's unraveling, per some reports. Honda, in the more enviable position, looked at Nissan as a troubled partner that needed more cost cuts, which apparently did...