I actually thought it was the captain's decision not to sail after the second incident. In any case, I think this is the right move, going on the side of caution, even though I read the ship could still sail, even though its speed would most likely be impacted.
Its probably a lot of logistics from Celebrity's standpoint. Those of you not familiar with Ketchikan, its airport is on another island from the town itself, and guests probably have to fly to Seattle, or Juneau to then get to their final destination. I know Celebrity is chartering flights, and do also know that there are regular commercial flights from Ketchikan to Seattle. However, its airport is small, and it looks like only one plane can get in at a time from what I saw when I was there.
2007 - Majesty of the Seas (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)