I certainly agree with that. Once the referendum had been decided there wasn't really an option other than to support to the decision to leave. I actually think the timing of the referendum benefited Labour. If the GE went ahead prior to that vote then Labour would have still maintained a formal pro-EU position and those Labour seats which voted leave would still have harboured that anti-globalist stance that led them towards UKIP and the right. The referendum result and Labour's commitment to carrying through the Brexit process removed a major bone of contention. The next election is surely a key test. The Tories are looking tired and will have been in power one way or another for potentially 10 or so years. The natural boredom swing away from the incumbent has begun. If Corbyn can't win a majority then they obviously have to come back to the centre.