Its the two year timetable where the madness lies. We've had 40 years of economic integration with Europe and now we're trying to replace it within two years.
I could perhaps live with a "hard Brexit", providing it were phased in over a minimum of 7 years. Time to sort out the trading and cutoms issues. Time to adapt. The thought of what might happen if we stick to the current timetable horrifies me.
For me, one of the most valid arguments raised by Leave during the referendum campaign was over how the EU might develop. "Ever increasing union", further enlargement, an EU army, the potential for meltdown in the Eurozone etc did seem to me to be valid concerns. If we legally leave the EU in March 2019 we wouldn't become immunised from those developments because they would still affect the UK, but we would have massively distanced ourselves from them. Massively reduced our risk. Even if nothing else changed on day one.
A legally binding transition plan whereby we gradually "take control" over immigration, gradually extricate ourselves from the single market is essential. If the UK and EU could agree that, I think the debate over hard v soft brexit would become much less divisive.