Sometimes you can say that one or two people did something no one else could have done.
Sometimes you have to acknowledge that one or two people did something no one else could have done the same way at any other time.
Business is constant adaptation (especially today vs. the recent past.) My business is doing fine, but if I tried to start my business today the way I started it 19 years ago, it wouldn't work. If I tried to tell someone else to start their business the way I started mine, they'd have to modify it or it simply would not work - because external conditions are not the same.
To be specific: It was the late 90's. Not a lot of people were familiar with or wanted to engage with eBay yet. (That time will never happen again.) eBay was a huge cash/slot machine. (That's over.) I was single. (That time will hopefully not happen again, or for a long time should my spouse pass away.) Gas was at least a dollar per gallon cheaper. (That's not likely to happen again.) Lots of music media lay dormant and ignored around the country. (Much of it has already been processed via ebay and other channels over the last 20 years, and if it sold again, the cost would be much, much higher.)
After many years in traditional retail management, I started selling music on eBay out of my apartment. I'd go to record stores, pawn shops, thrift shops, and garage sales, and purchased based on my knowledge of music and others' lack of knowledge. Eventually I quit my job and did that full time. I quickly exhausted the south Florida area, and couldn't maintain my level of business.
Long story short, my apartment building was sold to put up townhouses I couldn't afford, so before signing a new lease, I took a little drive around the country to look for inventory. That lasted over 4 years, until 2005. I went from town to town buying and selling, seeing the country, attending the Grammys, the Motown Museum, the Rock & Roll Hall of Fame, etc.
Eventually I came home and opened a record store, then expanded it, and then opened a second location.
If I tried to do that today, it would not be sustainable. I'd go broke before I got home. (Also, I'm married so that's not practical.)
So one way to look at that is I'm brilliant, look what I did. The more humble point of view is I was at the right place, right time.
If Walt was trying to build WDW today, he would have a very different experience than he did back then, that's all I'm saying. Eisner would face different challenges today vs. when he was running the show as well. Wall Street has come up harshly and has businesses doing backflips and definitely non-intuitive things (like when eBay had no reason to raise prices but did because they could, and there was a huge exodus of sellers to a site that wasn't doing so great with third party sales, called Amazon. The first few times I tried to sell on Amazon, it was a ghost town. Circumstances change.)
It's too easy to say, "Oh, just do this, just do that" in a vacuum without considering the costs and weighing them against the costs of routine maintenance, loan payments, investments in other locations, etc.
If the Imagineers are slacking, that's another story. If the biz side isn't listening to them, so is that. If they think they are making pronouncements on high and know better than their customers, that's hubris.
They are doing a balancing act. Every business, large and small, does it to some degree. The public eye of the internet is also a double-edged sword: easier than ever to get your message out, easier than ever for others to criticize. It used to be one disgruntled customer (right or wrong) might tell a few friends. Now they tell the world, and the cynical will just believe whatever they say (again, right or wrong.)
I hope shrinking the financial investment in Illuminations per night is not a primary motivating factor in this. I suspect it isn't, but it would be a bonus to the company if they saved a smidge per day on it. I'd certainly consider that if the end product was just as good.