That will not happen, at least not yet, that i am sure about. If it happened "CLAM" would be pretty much destroyed along with all the people invested in it. The losses would be way too big for everyone involved with JD. The Shitestorm would be too big.
Only way it could happen is if JD allowed to pay with both CLAM and BTC. But that would also most likely still crush CLAM to a point of no return.