When all the terrorists, scammers and other criminals stop laundering money through the crypto currency then bitcoin will collapse. The question is when they stop doing it
Do you really believe in what you say?
The number of all these dudes is negligible and marginal at best. Bitcoin transactions can be easily tracked down and most Bitcoin mixers (if not all major of them) are either controlled or directly set up by national security services. Big time criminals are avoiding Bitcoin like a plague, while small fish are irrelevant. Most of Bitcoin price comes from speculation, and if this speculation ends (which is an unlikely event, anyway) that might eventually cause Bitcoin price to collapse