Theoretically, if the entire population votes we will hit about 5 500 members of Parliament.
But roughly 1/5th won't have the right to vote due to being underage (or other reasons, but I think the Granger administration did some aggressive tinkering on limiting when people can be denied that right), and of the people that remain, not everyone will want to vote, nor will everybody who wants to vote be able to vote.
I wouldn't be surprised if we hit 2500 to 3000 members of Parliament, mind you. But we need better communication infrastructure for more, and probably improve public morale too, to get more buy in from the public.