Imagine you live in a small town. Something happens (COVID for instance) and your town becomes popular and your land value goes up. Yesterday your house was worth 100k but now it's worth 500k+. Your saying those people should essentially be forced out of their homes? To be bought up by rich people?
No, because
You would only pay tax on the unimproved value of land. You pay no tax on everything built on it.
Your unimproved land value may increase in that instance, but it wouldn't suddenly jump up the amount you're implying, unless the economy catastrophically collapses.
You're grossly overestimating the number of consoles they would "burn through" by having a few of their original original hardware set up in their museum. If you're worried about them running constantly, they could easily have a couple consoles per station that get swapped between throughout the day so that no one console is ever on for more than a few hours. People used their regularly NESes and SNESes for several years, I'm sure you could stretch that to decades of you had the expertise and resources of the company that invented the hardware behind you.
You're grossly overestimating the amount of money it would cost to maintain original hardware. As another user said, hobbyists can maintain an original system themselves for decades using mostly off-the-shelf parts. The rare occurrences where a proprietary Nintendo part needs replaced wouldn't cost tens of millions of dollars. There's thousands of shops that can manufacture small runs of custom ICs or circuit boards for a few thousand bucks. They wouldn't need to maintain a custom multi-million dollar facility.
Then emulate on your current hardware, if you're going to use emulation! Don't use a Windows emulator from who-knows-where, when you've repeatedly made clear that you're against other parties emulating your hardware! That's certainly more embarrassing by the way, if your Windows emulator crashes and museum goers are greeted by a Windows BSOD or whatever, instead of the Switch home screen or the Nintendo Online interface.
We're talking about NES/SNES games here (which Nintendo doesn't develop anymore, btw), because that's what they were caught using a Windows PC and a Windows emulator for. So either they're using someone else's emulator, or they ported the emulator that runs on the switch to run on Windows (which would be a huge undertaking, considering the architecture and OS differences between a Nintendo Switch and a Windows PC).
Emulation is not piracy.
Some of the ROMs on their official library contained signatures from popular ROM rippers, which indicates they straight up just downloaded them from one of the various ROM sites they've been trying to shut down for the last couple decades.
That's fine, I don't have a problem with anyone emulating anything, including Nintendo. My problem lies with their hypocrisy. If they want to emulate NES/SNES games in their own museum, go for it. But at least use your own emulator on your own hardware, given they have the ability to easily do that. Using a Windows PC and a Windows emulator for that is hypocritical.