Yes they should - ALL federal employees.
It will cost everybody more money to kick all employees into the exchanges. Obamacare coverage cost more than the fed employee program. The dems will bail out the union covered employees with an “equivalent supplement” so they don’t take a pay cut. They already did this with congressional staff. Then some labor board will find that all employees will have to get that supplement. That supplement will be more than the government share in the current program.