I'm about to do mine. 102k miles. Unsure if it was done before as I don't have any maintenance history so it will be done as a precaution.

Waiting until the timing belt brakes would result in a tow and depending on the engine design may cause bent valves, and other internal damage. Unsure if its an inference engine design or not. If its not then you can potentially wait until it goes but then you're stuck and getting a tow....

T.