To echo what's been said, BA bridges are still pretty easy to find here and on ebay. With as many has been sold over the long lifespan of the product and the fact that so many bass players can't seem to leave their instruments alone I think this will be the case for some time. Once they become officially extinct I don't think it will really matter since they are so many other and arguably better options.
"You won't know your worth now, son, until you take a hit
And you won't find the beat until you lose yourself in it"