Good comments, juggie. Pending the official results, there will be a lot of fevered negotiations.

Re: proportional representation, the Liberals could reason that if a NDP-Green alliance holds power, prop-rep is coming anyway. Therefore the smart thing would be to promise it to the Greens and stay in power. Making the change will take years, the party in power will have a lot of say over it, they have time to try and win Greens to their side, and time to rally the troops for an early election before any electoral changes take place.

I think the Liberals would say they agree to proportional representation, rather than lose control of government at this time. That's because they can easily weasel out of it down the road.