Forth Bridge, Aberfoyle

It was reported this week that moves are afoot  to designate the Forth Rail Bridge as a World Heritage Site. Also , at Queensferry, the new Forth Crossing is progressing alongside the current road bridge.
This stone bridge at Aberfoyle was built in the 18th century and is much less photographed (and indeed more difficult to photograph) than its more illustrious counterparts. Its claim to fame however that it is the bridge nearest the source of the river. Will the more famous bridges still be around 300 years from now?