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Complacency.
Also, the same it that made it more likely for people aware of bitcoin in 2008 to not buy bitcoin. 100x better things are either not believed to be 100x better initially or aren't initially 100x better.
... In either case, bitcoin wouldn't immediately go to zero, so perhaps it's not proper to call that a threat. The best I can imagine is that bitcoin will behave like gold behaves today - valued, but dated and impractical.
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What makes it more likely that this better money would be its own thing rather than an upgrade to bitcoin?