How could they run a space station without a lifeboat (Spare re-entry capsule)? This is a major oversight and should be corrected. Or are they waiting for the Titanic moment first?
I mean, even if they did, this isn't an emergency since they're not in any danger. The station is still working fine, they have plenty of supplies, etc.
The usual plan now is just to hop in whatever you came in and evac to earth. Right now the plan for the Boeing dou would be to ride back in the currently docked dragon. I think they'd have to ride down on the cargo pallet though so it wouldn't exactly be a comfortable ride. They'll have their own dragon seats once crew 9 launches later this month.
Basically they don't have enough docking port to keep two crafts for every flight docked to the ISS at all times so they just plan on if there needs to be an evac that the ones the rode up on being fine.