It's an interesting question but I'm fairly sure that after ten years Bitcoin has matured enough that all possible exploitation vectors have been tested. In th

It's an interesting question but I'm fairly sure that after ten years Bitcoin has matured enough that all possible exploitation vectors have been tested. In theory though this would definitely cause some chaos if something like this happened today, I don't know if it's enough to kill bitcoin but it would certainly drop the price. Most people only interact with bitcoin in a very abstract way through exchanges and don't understand enough of the details to care. If the exchange switched to the proper chain and everything appeared to be fine to the end user I don't think you'd see too many long term problems.