If that virus could take human form, it might say "let me leave the island". It would NOT say "Let me take my natural form of incredible evil, break myself up into tiny molecules, and use the world's wind currents to spread myself over the entire planet, infecting and killing everyone and everything."
This made me SnortLaugh in my office. I'm drawing attention.
Omg...that would definitely be like that movie, "The Happening." Or "The Crappening" as so many here belovedly called it.
Worst...movie...ever. I've got too much faith in Lindelof to let something like that happen.