Its just a matter of time. The leftists had to band together to keep the rightists out of the government in the last election just a few days ago. Next time they will probably not be able to pull it off.
The Swedish "moderate right" party bailed from the center-right coalition to throw in with the Left, as the only way to stop a coalition which would have to include the anti-immigrant Swedish Democrats.
Something like #NeverTrumper "Repubicans" siding with the Democrats to oppose Trump.