No way, NO WAY Nissan is dropping the Sentra. The Sentra is currently Nissan's best seller. Kinda shocked me a little bit, cause the current Sentra is probably the worst car in the class.
Look for a new Sentra to debut very soon...there is a thread in here about it somewhere. It will finally get some much need styling and design upgrades as well.
Of those three cars, if anyone of them had to die it would have been the Versa. Sentra, for better or worse, has much better name recognition and longevity compared to Versa..and the Sentra's class of cars has higher profit margins and is larger overall. Car markets are shrinking but the Versa's market is dropping faster. I think Nissan is smart to stay in the class though cause with this new one market share will definitely grow as other car makers walk away from the segment.