I don't believe that there is ANY chance of Disney not adopting a similar policy unless a recession begins ASAP. Which we're still a ways off.
The questions are when? And what the exact form will be?
The second one is the biggest question.
They've already raised annuals roughly 32% In aggregate over the last 11 months - that is partly to set the stage for tiering (opinion)...
Now what will be next?
Perhaps universal tipped their hand for both by not doing it on multidays?
The logistical problem will always be that if you require anything short of firm "ticket reservations" on set days - then there will be a big problem with overlap for stays...something that needs a fully dynamic, but firm system like resorts.
It could be that tiering for multidays is impossible without shrinking the 14 day window. I don't think they will get away with "overcharging" for days that then aren't used during the appropriate crowd level.
What I read in the survey, is that you would have to buy each park ticket individually based on the tiered level applicable, then they would apply the "bulk" discount. So, if a few days of my visit were silver and a couple gold, I'd buy say 1 MK ticket at silver, 2 other park tickets at silver, 1 MK ticket at gold and 1 other park ticket at gold. Then, they'd apply the 20% discount for buying 5 passes. It's a horrible, HORRIBLE plan. I mean, as if FP+ didn't force people to plan parks enough as it was, this
really will. And I can see it being very confusing for people. They did say that guests would have the option of buying "gold" days and using them anytime they go (like that's a big perk), likewise, they could just buy all MK tickets and use them at any park they want.
I really hope they don't go tiered like they had proposed. I have no problem with tiered if they do it like Universal, without raising rates, with cheaper rates on the lower times, and if they don't touch their multi-day discount. But... I know that's about as likely as you know what freezing over

It's sad because, the only time of the year that we can go due to DH's work is "gold" season. So, we will be one of those families that loves Disney (well at least myself and the kids) that will never return, because I refuse to pay $2000 (US) just for tickets for a few days in a park, $1200 was pushing it enough as it was. I'm tempted to try and buy a set of 4 tickets this spring after income tax, to just hold onto for a future vacation, but... I'm also nervous that they wouldn't honor them.