I'm not trying to defend the cable company (hate them anyway), but I just want to point out one potential problem with the thinking: it's very likely that the 10% of channels that you are interested is in the 90% of those that others think are pure crap. The original idea to charge a lump-sum subscription fee instead of a-la carte is precisely to combat this trap. Otherwise, many niche programs will not be available in the beginning.
This was just an artifact of 'circuit-switched' CATV networks. With an IP-based network you can have 100,000 channels that cost nothing as long as they're not being watched. Literally anyone can start their own cable channel. (Starting to sound familiar yet?)
In such an environment, a la carte programming is the only thing that can possibly make sense. The tiered plans are gone for good, and cable companies will just have to deal with it and get over it.