I agree with Manuel. There may be some increase, but most trans-canal cruises I see are 14 or 15 day cruises between US ports. That's outside many people's vacation window.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014