These kinds of attacks will only prove how strong Bitcoin really is. These types of companies will continue to lose customers and revenue until they are forced to:
A) Start accepting Bitcoin again.
B) Shut down the company.
companies like this are already hemorrhaging money specially with the high cost of advertisement that they have. but they won't go under any time soon because they mostly make money through alternative ways and then spend that money in their sinking ship because it helps make those alternatives look more legit. in this case bcash.