You're probably right. But that's a Disney planning issue. I can't believe they didn't think there would ever be this many Platinum members - I'm sure one of their main goals is to have guests return time after time. But it feels like a bit of bait-and-switch when they dangle rewards to get people to strive for higher tiers and then take the perks away because they become impractical to carry out.
The biggest problem is that they have continued to take away perks without replacing them with anything else that could be seen as valuable. They could easily add something like free wifi, a free custom drink each day, a free 8x10 photo, an upgraded room service menu, etc. - any number of things that would actually cost them pennies (their actual cost). Instead, they've just taken away perks without replacing them with anything else. Compared to other cruise lines,
DCL's "loyalty program" benefits are very lacking. They probably just don't care because they still manage to fill up ships without offering any perks.