While today's issues such as phishing, identity theft and spam already pose a significant problem, the future will bring forward problems we still don't think about. Imagine an attacker breaching the security of your networked home and changing the settings on your alarm or the stove. Imagine a proliferation of nasty malware on Bluetooth and GSM networks. If you work in the information security world, I'm sure you can imagine a lot of dangerous complications.
The Internet is complicated because it's dynamic by nature. As we rely on the Internet more every day, we have to invest resources into research and security on all levels. Remember, information security is a journey, there are always new challenges. What became evident to everyone attending the 1st NIS Summer School is what Dr. Jorgo Chatzimarkakis noted: "Network security is like oxygen - if you lose it, you realize its importance."