Gradual? Contribution rates have more than doubled in the past 10 years. Until 2011 (or possibly 12) there were restrictions in the law about how quickly rates were permtited to be changed - no more than 0.4% per year. With that restrictor removed, contributions have grown significantly; this year, deductions on amounts up to the YMPE have increased 0.9%.
I support the increase in contributions to make the plans reach a 50/50 split (well, 50/50 for the public service; military and RCMP plans will contribute at the same rates but not reach that split), but we need to keep in mind the pain these changes cause.