Carnival is a business and they wont do much without prodding. I would be shocked if oil stays below $70 for 25 days. It just takes a one day spike to reset the clock. Suck it up folks.. if you want to cruise be ready to pay the piper.. or at least the oil companies..
2008-Valor and Glory
2009-Spirit and Splendor
2010-Freedom of the Seas and Mariner of the Seas
2012-Allure of the Seas and Navigator of the Seas