I'm not sure... I think the failure of the RMT is to get the public onside with their message but a more general strike will show up the incompetence of the Tories. The public is generally unsympathetic towards the RMT believing them to be overpaid anyway (rather than their wages have been keeping pace with changes in the market) - they'll be less inclined to come down heavily on teachers and doctors.

The Tories ran a whole campaign based on the fact that Corbyn would take everyone back to the 1970s and then Boris Johnson steered the country there regardless with ever declining popularity on a minute by minute basis. The RMT might not be popular, but they might also be the canary in the mine signalling a general worker dissatisfaction with the Tory Government..... let's remember Cameron et al literally starved some people to death in the name of austerity - which turned out to be a hiding to nowhere.

The UK can be left wing when it wants to be, but it vacillates... once the left proves how inefficient it is, they move right until the right proves how mired in sleaze and self interest they are, then it moves left. We're long overdue a left-wing move and Bonson feels like the last ditch idiot the Tories have left because all the adults have gone home.