They have more satellites than needed, so even if a few fail it is still ok. Plus they are sending another up I think early this year and will continue to do so to keep it up to date.
Power and Motoryacht ( Feb 2010) said the Loran budget was not renewed and by the time you read this article the signal will be already turned off (early Jan was the cutoff date, magazine came in mail today).
In all honesty, it's a dead technology, and has been at best over the last decade, a needless back-up to other navigational offerings. I doubt it will be missed too much.