In all honesty, if you remove all the automatic decision in KIS for example, it will be almost as "noisy" as CIS is with default settings. So CIS is not far behind mainstream suites, it just needs an automatic mode and friendlier pop-ups. On the other hand CIS scores better than other suites in HIPS tests, but those are synthetic tests, they are not based on real malware. With real malware you also have signatures, heuristics and cloud blacklisting to protect you - layers of defense that are not taken into consideration in HIPS tests. So I think that CIS will still be able to protect the user from real threats even if the default level of protection provided by HIPS is lowered a bit to make it more user friendly.
COMODO made a step in this direction by introducing the auto-sandbox. Many CIS users (me included) complained that this lowers the default level of protection. We are wrong. For us it is easy to tune CIS so that it offers more protection, but we are also able to stay away from malware in the first place. For normal users this makes CIS a less noisy product, more usable.