I would guess this is more a 10 year plan, rather than a 3 year plan.
I'm going to disagree with this because we haven't seen Disney stick to a 10 year plan, yet.
We can look at Universal and see them sticking to their 10-year overhaul plan that they announced a few years back. You can see each step as they work their way around their parks.
Disney? Not so much. Typically what you see at Disney is a 3-phase plan which amounts to:
- phase 1: definitely / very likely
- phase 2: ok / maybe / probably cut back
- phase 3: pie-in-the-sky (it's not going to happen because by the time they're at this point they're way over budget from 1 & 2 and the turnstile numbers are up anyway so 3 gets dropped.
DHS has 3 phases and I'd bet that we never see anything past Toy Story Land (already cut back) and Star Wars.
Disney seems to operate on a "catch up until "good enough""-plan cycle and then it usually fizzles out. The current management haven't shown any signs of changing that mentality and, if nothing else, they err on the side of "don't do it".
You can argue: What about Pandora? What about Rat? What about Guardians? What about Tron?
All of that is playing catchup to 20years of nothing. They're doing it because they have to, not because they want to keep the parks fresh. Pandora was an answer to, "We didn't get Harry Potter," and, "DAK needs something". It wasn't an answer to, "Ok, we got DAK open. How do add things in a timely way so we can expand both our park and our audience?"
Again, if you were to make the argument that Universal was more of a 10-year plan (which it actually is) than a 3-year plan then I'd be right there with you. They not only announced it like that but, as stated a moment ago, you can actually see them doing that. To be fair, they also let their parks languish up until Potter. Universal was very "blah" to me up until 2012. Potter was a great addition but seemed like a one-trick pony until their "refreshing the parks" announcement and then actually doing it.