A major part of the disenchantment probably comes from the increasingly stylised and monotonous presentation that the major broadcasters have adopted.
The inability to feature a presenter whose teeth are less than perfectly veneered, the improssibility of showing subjects which are likely to attract a less than an X million audience, even for the smaller stations, and the continuing commitment to spending tariff rates which encourage slick at the expense of interest, are all contributory factors.
As the producer of some of the very rare original ultra-niche programme content on some satellite channels, I know just how easy it is to engage with real, ordinary people by being a real ordinary person on TV - one broadcaster who spent a day on my (provided free by the organisers) stand at the NEC was stopped in his tracks after counting the 500+ individuals who hunted us out to shake my hand and thank us for producing the programme!