Of course the Nazis were democratically elected...

That's me being pedantic, I do get what you mean.
I could be even more pedantic and bore you all to death with a lecture about the state of democracy at the end of the Weimar Republic but I won't and just leave it at this: they did get rid of parliament as soon as possible. Which is what I meant.
Perhaps it's simply that, having been defeated with an Emperor at the helm, and having been defeated with Davros in charge, maybe they've decided to go down a more egalitarian route...
As I said, I think it's an interesting notion. But it's odd to introduce this and then not do anything with it and not explore it further. Then again, maybe someone will in the future.
I think it was just a throwaway comment really, akin to that episode of the Simpsons. "Oh let's just call the big Dalek meeting a parliament."
Well the Parliament bit might be nitpicking (though when every Parliament in the world means a democratically elected body, you'd think a more appropriate word would have been come up with),
according to Wikipedia:
"The Great Hall of the People ... It functions as the meeting place of the National People's Congress, the Chinese parliament."
So how you define a parliament is different to how individual nation define their own parliament.
But then, Doctor Who is a British show for primarily British people, whose understanding of a parliament will be a democratically elected body. And the Chinese wouldn't be calling it a parliament either, because they are chinese.
And in the 70's it was established that Timelords have a President, and Briton's understanding of that would probably be along the American model, yet I don't recall any 'Doctor/Borussa 4 More Years!' bumper stickers!
Like I said, Sci-fi is full to the brim with human words being used/misused to represent alien concepts.
The Daleks had an Emperor, there was an Emperor in Star Wars, as well as a Princess and a Queen (and one not recognisable to us as a Queen as it appears she was elected) The Centari have a Prime Minister and an Emperor, the Klingons have a chancellor, the Romulans have a Praetor...
Now personally I kinda like it when writers come up with something that at least sounds original, like the Kha'Ri in Babylon 5, or the Grey Council (although a council obviously isn't that original) but I fully understand that you can't always do this, that using nothing but made up words can put off an audience, and that writers of all eras have used recognisable words as shorthand, it's what they do.
As for the Dalek parliament, two points. First, maybe it's meant as, you know, irony, that a race so much the antithesis of democracy would call their leadership by a name so closely associated with democracy, or maybe, as I've said, as crazy as it seems maybe the Daleks do have an oddly democratic system, one Dalek one vote and all that? Clearly following a dictator hasn't worked out so well over the years, and remember, the Cult of Skaro were tasked with 'thinking the unthinkable'.
Did the Daleks manage to exterminate anyone during this episode? I'm trying to think of an example, but I can't-- everyone dead was dead before it began!
No one has been exterminated since Moffat came in.
NOW DO YOU ALL SEE THE PROBLEM WITH MOFFAT?
NO! I DON'T HAVE A PROBLEM WITH IT, AND GIVEN THE STORIES THE DALEKS HAVE APPEARED IN, THE LACK OF EXTERMINATIONS IS TOTALLY APPROPRIATE.
(So one of the things that you dislike about Moffat-Who is that there aren't enough people being brutally killed? Seriously? Wow...Classy.)
Also, didn't the Daleks exterminate a couple of British soldiers in Victory of the Daleks?