One should not look at Japanese politics through the same reference of view that one views other countries, especially mature democracies such as the US or the UK. Certain change could be the much more likely outcome of a landslide election in many other countries, but it would be extremely difficult to guess what will happen here.
First, and foremost, it must be remembered that the basis of the DJP goes back to 1992 and the disgust of the public of the corruption within the LDP. One of the events that year was the discovery of $100 million in cash and gold in the safe of Kaneko, a predominant party leader. In the resultant mess, a number of short-lived parties came and went as many Diet members defected from the LDP, forming various new parties, which were combined with others.
Among the defectors was Ozawa, a kingmaker and one of the two heirs-apparent (is this a real word?) to the Takeshita faction when it’s leader Kaneko was arrested. Ozawa, as a leader in one of the more corrupt factions of the LDP (more because of better opportunity as a champions of road and dam construction, with greater potential for kickbacks than any fewer scruples than other factions which had the misfortune of relatively fewer sources of as much cash) is nothing but a shrew politician. Waving the banner of reform and along with co-leader Hata, he bolted from the LDP taking a 40 plus change of lawmakers to form the Shinsei-to.
During at period, it seemed that parties were being formed daily. None, of which were really distinguishable ideologically from each other. Those fun days. There were the Japan New Party, with its new candidates and Sakigake another group of LDP renegades, among others, and the spectacular collapse of the Socialist Party, the traditional ineffective and permanent oppositional party.
It’s been said that that it would make more sense to realign lawmakers from the various parties into ideological differences instead of the hodgepodge of essentially independent versions of the traditional factions of the LDP, but that’s not going to happen.
There really isn’t a competition of ideas and ideologies in Japanese politics. You don’t see a debate over more or less government or alternative solutions to the declining economy. You have to remember that there isn’t a history or tradition here of real democracy, and I’ve never gotten a sense of any sort of political awareness during the 20 plus years I’ve leaved here.
I’d be interested to see if they can really pull off any fundamental changes, but I’m not holding my breath.