Funnily enough, most people's answers here, or rather, arguments, have been "progress for progress sake" type affairs, which is laughable. Arguments like those can be easily countered with the "if it ain't broke then don't fix it" motto.
Analogue TV was, for the most part, fine. However, the main argument for switching to digital is that a digital signal for any given channel takes up far less bandwidth or "airspace" than an analogue one. So much so, in fact, that when one analogue signal is removed, many digital ones can take its place. In the context of TV, this means that more channels can be offered, including free to view high definition channels which there would previously have been no space for.
DAB radios have failed to capture the nations interests for now, but that will change soon enough. The technology and the end user experience is arguably not the factor that has held these devices back, as much as it has been their price comparative to standard analogue units, and their availability in everyday use. For instance, car manufacturers have been hesitant to include them as standard. The change will occur, just more gradually than was anticipated. Continued...