I've spent a total of 2 days (4 years ago) in Disney parks, so I'm not exactly a power user. I don't really love to plan, but I do research the heck out of almost everything I do, and I am most certainly looking at it from Disney's business point of view, because the whole intent was to consider how they could implement this.
I think your point is that
Disney vacations have become excessively complicated, requiring guests who wish to economize or extract maximum value from their vacations to be extremely familiar with the whole process and make detailed plans months in advance. You're absolutely right. And yes, tiered ticket pricing is inherently more complicated than a single price strategy, no matter how they implement it. Some people will probably be confused, and Disney will have to deal with a minority of guests that show up at the gate with a Bronze ticket on a Gold day. Their answer will be to offer them an upgrade. The guest will almost certainly pay, because they've come all this way to go to Disney, and the idea of telling 5-year-old Sally that we're not going to Disney today after all is probably not very appealing. I'm certain they're hoping that most people will just buy the Gold ticket to avoid confusion in the first place - and many will probably do exactly that.
Disney is clearly not concerned about adding some more details into the planning process. The people who care will figure it out and work with it, just like they do now with Fast Passes and ADRs and crowd calendars and all the rest. The people who don't care will call Disney and book whatever package Disney tells them to book. Then they'll show up with Gold passes at 11 am on a Bronze day, with no Fast Passes booked, and wait in line for 2 hours for a single ride. My point was simply that anyone who is hoping that Disney will delay this or give it up entirely because it's logistically too difficult to implement is likely to be disappointed. It's just not. Please don't shoot the messenger!