I wouldn't say it died just because Ninty released the final major update. Sure, there won't be much new stuff for people to look forward to anymore, but they've just started using these new parts and will continue mastering them in the coming months.
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Also, since Mario Maker 2 is the latest game in the franchise and because of how unique it is, people will most likely go on playing it for years to come, same thing with Mario Kart 8 and Splatoon 2.