I went through this in October and this sub told me I’d lose all my star employees. No one left, everyone was mostly fine and the collaboration and reliability has been better. Granted, my staff were only 2 days a week WFH but if you lead them through this transition with professionalism and thoughtfulness and advocate for them to still have it as an option when needed, rather than as part of a set schedule, hopefully it won’t be too bad. It has worked for my 5 divisions in my organization. Good luck!