As platinum, who cannot afford right now to sail to use my platinum benefits -- I'd vote for better discounts for platinum members since getting to 10 cruises can be difficult and expensive for some.
And I agree with a PP who said there should be more tiers -- like Diamond, etc. Many cruise lines do their tiers by number of days sailed -- but I think that would be "unfair" for Disney to start that as so many have racked up their days by doing the 3 and 4 day cruises that they would be way above Platinum at this point