I doubt they would limit it to one. My guess is that the limit is in place to stop people buying boxes of them (for resale), but a few should be fine. IIRC they kept running out of Vegeta last year because of people buying boxes full of him.
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I hope you're right I was just deciding between three things yesterday when I pre-ordered Frieza Saga Goku from somebody on Ebay (which seemed to be a "veteran" SDCC goer). I was thinking of getting a master airbrush kit, a Figma Thinker, or the Goku lol Of course I went with Goku, I just hope it works out fine