No, the potential ability for fringe groups to make the government accountable, and on a more regular basis, which would mean the ability to call elections to come around instead of waiting for regularly scheduled election days. My aim would be to keep the politicians nimble and alert--might even keep them so busy they would possibly find less time for pages...
Not sure if five parties is the right number but I am convinced that two isn't.
The number of parties is probably less of an issue than whether or not the Senate and the House of Reps move to proportional representation.
There are an infinite number of factions within both the Democratic and the Republican parties, which pretty much mimics the division into multiple "mainstream" parties you find in Europe, where the "multiple" parties form coalitions regardless, much like the different factions within our "two" parties.
Proportional representation on the other hand has its ups and downs like everything, but it is clear that it allows fringe groups to enter government, although I'm not sure that increases "accountability" - as it all depends who the government is responding to.
The extraordinary success of the frightening FPO in Austria is in large part due to their system of proportional representation (Austria is no more racist and xenophobic than France, Germany, or the US, but they have a political system that allows radical racist and xenophobic parties to enter into government), and of course whether or not the FPO increases accountability depends on who you ask..
Anyway, what was that about wine..