There is certainly no consensus among physicists that QC is possible. But I think at this point it is more about reducing the cost of a real implementation down

There is certainly no consensus among physicists that QC is possible. But I think at this point it is more about reducing the cost of a real implementation down to something manageable. (Ie. current schemes would be 10s of billions of dollars+ to build.) And as for Bohmian Mechanics, I think this is just a re-interpretation of quantum physics, and not actually a competing theory.