Berlusconi's PDL will be an interesting case to look at when Il Cavaliere himself dies (politically and/or personally, which may be the same...).
Indeed. Though it's not only the PdL, which is nothing more than Berlusconi's personal machine filled with first-class political nonentities and/or idiots (just look at the PdL candidate in the Florence local election this month, lol), but a lot of other parties. The Second Republic has become a party system based around one man - Berlusconi. The parties either oppose him or support him. When Berlusconi disappears, the PD could be threatened if Berlusconi's disappearance means the end of the Second Republic and a return to a sane ideological party system. Then you would obviously have a right-wing non-Berlusconi party which could undoubtedly include the DCs now gone to the PD/Italia dei Valori and a left-wing party (along with the usual irrelevancies, Communists, fascists and so forth).
Most of Vlaams Belang's lost support has gone to the N-VA or Dedecker's list. I think (and hope) that Dedecker's good days are over and the N-VA could obviously lose votes. Anyways, Flemish nationalism has only been getting stronger these days, although maybe slightly less Nazi.