Your employees need skills that are useful and in demand. They need those going forward, whether you close your data centers or not. I'd suggest you be upfront

Your employees need skills that are useful and in demand. They need those going forward, whether you close your data centers or not. I'd suggest you be upfront with them. Use this as a pro-active way to show you want them around, but it's not business-as-usual. The good ones will see this as an opportunity for the long term, while others may view this as a time to move on. To reinforce plans, show them what skills you need after the move. This will give a north star to motivate those who want career mobility.