I've never heard of it happening. I'm sure if it <b><i>did</i></b> happen, they'd have you park at one the other cruise terminals at Port Canaveral (all Port Canaveral cruise terminal parking lots are operated by the Canaveral Port Authority) and shuttle you to the DCL terminal.
What happens is they would park you in the day lot or in the cast/crew parking area. All are connected together with the Wonder lot and chances are you wouldn't even notice. Never seen them run out of spaces though.
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