As much as I agree that Bitcoin can disrupt the current way we do things, it does have fees. The goal is for those fees to be negligible, and while it currently is, that could change in an instant if the scalability issue isn't addressed. I would also contest security as a strong selling point because while it could be more secure, it could be more vulnerable than traditional banking storage in some instances.

If I were to point out qualities that could disrupt the system, I'd say decentralization, because nothing other than other crypto can boast that quality, and convenience, because you're able to send any amount anywhere cheaply and nearly instantly.