Ruined seems like very strong phrasing when nothing important has been ruined.
They sell new Lego sets in stores every day. They might seem expensive for a few bags of plastic bits and some instructions, but then: They've never been cheap.
A kid can still grow up playing with Lego today, just as they've always been able to.
I still remember building my first new Lego widget. Set 918. It was just a small basic spaceship and no real accessories but a little Lego space dude. I'd already scattered the pieces around and stuck them together in strange ways when I noticed that there was an instruction book so I could assemble it the "right" way. That may have been the first instruction book I'd ever followed; I remember the sense of wonderment as I learned the value of it. That model didn't last long before I tore it apart and went back to sticking the pieces together in strange ways. :)
Anyway, it seems like it would have been about $6.50 back then, or about $31 in today's money.
That's not so different from today's prices -- in fact, it looks things may have actually gotten a bit less expensive since then for a given amount of complexity.
That's not ruination; it's the opposite of it. The kids are fine. Lego is fine.
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I do see that someone on eBay that someone hopes to get over $2,000 for a new, sealed copy of set 918. That's a about sixteen more fuckton more than $31.
And I can't justify spending that kind of money on some Lego.
But I don't have to spend that kind of money. If I have a Lego itch that I want to scratch, then I'm a grown-ass adult. I can just go to the store or some online seller or whatever, and buy a new set that I like, and put it together.
I don't need to spend $2k to pretend relive a part of my childhood. I already experienced it once, and I remember that part very fondly.
Nothing here is ruined.