I mean, I have no idea how one can say the parks have increased in value at anything like the rate ticket prices have risen. We’re talking about theme park tickets, so let’s focus there. Magic Kingdom added Splash Mountain in ‘92. That’s significant added value. Other then that, where, specifically, is the added value that justified exponentially increasing ticket prices? Buzz Lightyear instead of If You Had Wings? New Fantasyland instead of 20000 Leagues, Snow White, and Toad? I mean, those seem like very definite lateral moves - certainly not huge pluses.
And as for EPCOT - I would absolutely take the 1984 version over the current mess. No question, not for a second. What is there now is an absolute embarrassment - it’s inexcusable that they charge full price for it.
And those were the parks you could pay for in 1984. As for the newer ones, MGM has gotten better - but it opened as half a park, and most of the massive price increase took place while it stagnated. AK has improved with the addition of Asia and, to a lesser extent, Pandora. But the very fact that those two parks improved reveals part of the problem - they both opened during the period of massive inflation, and unlike their predecessors at opening, neither was a complete park, but they charged full price.
So no, I can’t see how the increasing value offered by the parks has come anywhere close to justifying the price increase.