The problem with that, of course, is that Tory MPs across the country have been told categorically by their constituency parties that they will face electoral meltdown (mass-cancellation of membership, no volunteers, no canvassers, no nothing) should they facilitate such an outcome.
That doesn't mean they won't be stupid and arrogant enough to do it, but it will destroy them if they do.
Oddly enough, the longer this thing has gone on, the more I've come to admire the strategy of Labour. They've committed to nothing from which they cannot retreat and have given themselves plausible deniability on any and every outcome.