these switchers will be the ones most invested into NoDealGloriousBritanniaRulesTheWaves-ForeignersOut.
I don't agree. I imagine loads are the 'I really, really can't cope with the ongoing agony and uncertainty of this interminable hell of dragging Brexit out. Let's just get it done. Whatever it takes to get past the impasse.'
I have sympathy for that position in a way as the will we, won't we, extension, extension, extension is exhausting and stressful. Something needed to give at some point. This GE was the tipping point for many people who were just utterly, utterly fed up of the whole stalemate. Even if they know the next stage might take ages, they just want to get to that stage.