I found a short read that has some relevant information in regard to companies making changes/upgrades to their tech stack.
At the end of the day, companies that are not forward thinking are going to come up against all kinds of issues. Employee turnover is just one of these challenges, but it can really have an affect on the bottom line.
When making changes, it is important for everyone to understand the "why" behind it. This will lead to all employees understanding the long term vision of the company. "The entire organization must understand the magnitude of change that is going to be involved, not only in the implementation but in how much it changes the business."