The economic fallout all along the waterway will be serious. And without boats locking, there will be nothing for tourist to see. The Rideau Waterway will no longer be a "working" canal, and will definitely lose its status as a World Heritage Site. At that point Parks Canada will justify laying off canal staff and their office staff who manage heritage canals.
Once the canal and the spiderweb of tourism and business is destroyed, there will be no way to restore it.
Email your objections with reasons to firstname.lastname@example.org by February, 2013.
Parks Canada: User Fees Proposal - Public Consultation
Ottawa Citizen editorial: Sinking canal usage
Ottawa Citizen: Rideau Canal structure would almost triple fees
Facebook page: Save the Rideau and St. Lawrence
"Boating in Canada News"