The unelected politicians are the people running and funding the ERG, which is doing it's best to push us towards a hard Brexit.
I would propose that we let May get on with the plan that she has put forward, take it to the EU and see if they will accept it. Then take it from there. It seems a big compromise on both sides but what do both sides expect? As I've said, I don't think the politicians scheming to challenge May and push us towards a hard Brexit represent the majority of people in the country (the 48% remain voters + % of leave voters that want a deal.
So I want May to be allowed to negotiate the best deal possible as she was voted in to do, a deal that would be the best compromise that wouldn't make either extreme happy but is the fairest compromise. Fair play to her for facing down her party opponents on this.