Will your IFR GPS tell you in advance that sattelite 30 will be u/s from 15:15 tomorrow until 03:15 on 1st March?
No idea, but GPS outages will be notamed, and you do check your Notams don't you DFC? I hope so. I don't care if satellite 30 is going to be U/S so lonag as I can still position myself. It is not very often spacecraft just "fail", they may be shut down for some reason, in which case we all know about it in advance - if you care to check.
Actually I believe in the GPS message, satellite health information is transmitted.