I do think the amazing run bitcoin has been on is just about over. The world has been made aware of bitcoin and thus it has been thrust into the national spotlight. Countries like south korea and japan have already begun placing regulations on Bitcoin and its only a matter of time before other countries begin placing strict regulations on it.
Bitcoin became popular due to its anonymity. At one point you could buy bitcoin and it was basically untraceable. Unless someone came under heavy scrutiny it wasn't possible for bitcoin transactions to me monitored.
Many marketplaces on the darknet don't even allow bitcoin anymore because it isn't secure. If there very people who made bitcoin popular stop using it I don't see how anyone can expect it to continue to thrive.
There are lots of other crypto currencies much more secure than bitcoin but in the end none of them are investable. Buying any cryto currency for the purposes of investment is akin to gambling. Could you make money doing it? Sure. Is it a smart thing to do with hard earned money? All successful investors agree unison thats its not a smart thing to do.