Here’s a provocative article for your consideration. Instead of worrying about all your employees leaving, start focusing on the ones who really might leave.
According the article, most people have no intention of leaving. My experience suggests this is true. Therefore, I’d change my focus on how to deal with the 85%. For them it’s about engagement, and helping them want to do their best work.
The 10-15% who are always looking for the next challenge just happen to be your rock stars. These are the employees you need to figure out how to keep on board.