I hope not!
Because if they do then everybody they have mutual aid agreements with will need to have radios programmed in order to communicate with them.
That means added cost. Face it not many low budget agencies don't have that kind of money to spend unless they luck up and get a federal grant.
Most departments that do get a grant spend it for staffing, building a new station or other equipment purchases.
Sure I can see Law Enforcement being Encrypted.
Why would you want to waste money to Encrypt Fire, EMS, and Rescue with the exception of maybe hospital encode reports.
I don't believe anything till it happens.
Just my thoughts
David