The combined Conservative and Labour share of the vote fell to less that two-thirds of the total ballots cast for the first time since 1918, the election that followed the great war. That’s important because the two main parties have dominated politics for generations but their stranglehold is slipping and has been gradually eroded in successive elections since the middle of the last century. In this election is was around 65.3%. What that means is that even under the first past the post system hung parliaments are increasingly likely.
In order to form a majority administration Labour or Tory parties in the future will have to include the LibDems. Wouldn’t it make sense to get in first and build the foundations of future coalitions.