Nightmare scenario for Nintendo.
Given the current landscape of using LLMs to decomp/reverse-engineer everything, I wonder if gaming corporations will try to get on their communities' good graces by being less "hostile" towards the users; I don't see anyone rushing to decompile Valve games, as they provide a good service and are well liked by pretty much everyone.
My suspicion is that Nintendo, litigious as they are, will shut down any decomp project that pops up and attempt to pressure Anthropic/OpenAI/others to extend the guardrails in their models further to "protect their intellectual property".
Reasonably sure you'll be able to do the same with DeepSeek in a year if not already.
One of the first in-browser vibe coded game demos I saw was Half-Life 2, fwiw. Not sure if it was decomped.
Valve's Source Engine has pretty famously been source-available for its entire(?) lifespan, there's no need to decompile their games.