There are certainly “things that can be done”. But there are also things that can’t be done in the timescale, because there isn’t, and hasn’t been, the organisation in place preparing for it. There is no realistic chance of a “hard Lexit”, for example.
I agree with Costas Lapavitsas that WTO rules could provide significant opportunities for a left inspired restructuring of the UK economy. The hit we’re (the working class, and more) going to take is based on the way the situation at 11:01pm will impact the future of the economy, but beginning with the economy as it is structured now; the way it has been shaped over the last few decades. It has been deindustrialised and financialised by neoliberalism. It needn’t be that type of economy that the UK responds to Brexit with.
However, there has been no groundwork, there is no organisation, there is no preparation, to get us there by 29th March.
So, yes, the UK is Brexiting by some kind of right wing map, still being drawn, and the options open to us now are reactive.