Well, as you mentioned it, Bitcoin has to level up its quick and secured form of services. I have not heard of large time hacking incidents involving Bitcoin but as the hackers are always looking for ways to succeed, Bitcoin should be able to anticipate them and be one step ahead all of the time. As to its quickness, there are more than a handful of coins that can beat Bitcoin. This is something that Bitcoin should take seriously and urgently before it's too late.