The silent majority / secret Conservatives don't exist. These won't win them the election, and the further right they go the less ordinary voters (the ones they need) they'll get.
The people who voted to get Brexit done and give Boris the huge majority aren't making the same mistake again. They voted for one reason, and I doubt they're going to vote purely on the boats when they can't get NHS treatment, pay their rent/mortgage, afford food or to fill their car (actually now it's more likely insurance killing people) etc.
Almost every moderate Conservative knows they're gone and will need to regroup and they absolutely must eliminate the lunatic headbangers and start again.
I switched from voting Tory to Lib Dems in 2015 and now I'll vote strategically to get the Tories out, which in my case is Labour (and probably for most). I don't need to second guess my decision as this party has done untold damage, and not just with Brexit. Now they're just stripping everything they can because they also know they're gone - and that's what annoys me most, as they seem set to wait until the last possible moment for an election.
Not because they expect a massive turnaround that will win votes back, but because they can milk the nation dry and leave the next Government with a massive uphill battle to try and fix things. And if they can't do it in five years, the Tories will try and win power back by demonstrating how bad Labour has managed things.
I don't normally like parties that blame their predecessors for many years, but NOBODY can quickly fix things given where we are.