Conventional CCTV systems are very good post-incident tools, since it holds critical video evidence for investigation purpose. While it has good deterrent effect, CCTV are often misinterpreted as a silver bullet to security challenges.
The reality is ultra-high resolution cctv also produce too much information. Video storage has become cheaper to buy but expensive to manage. Research has also suggested that the abundance of video information has made it impractical for human attention-span to deal with.
The solution is smarter video and storage management, and even smarter systems that will detect abnormalities in dynamic situations.