How do we save MV's sign language?

Alright, so from the 1800s to 1952, Martha's vineyard had it's own sign language that almost everyone, deaf or not, knew. With a pod of 1900 or later, how do you stop it from going extinct?
 
Alright, so from the 1800s to 1952, Martha's vineyard had it's own sign language that almost everyone, deaf or not, knew. With a pod of 1900 or later, how do you stop it from going extinct?
Prevent the rise of tourism somehow, possibly by crippling the industrial economy or preventing the peaceful conditions necessary for the industry to flourish (but keep the island itself out of the conflict, so that it isn't disrupted).
 
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