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That's when the world will have Bitcoin. Right now, we have it too, but it isn't the same. Bitcoin is still being issued, and it will continue in its issuance period until then, at which time it will "have been issued," past tense.
By then, one of two things will happen:
  1. No one will notice or care because it'll be dead.
  2. Everyone will notice, adapt, and continue using Bitcoin as they have been.
To paraphrase Satoshi, there'll either be hardly any network activity at all... or a lot of it.