Then it isn't realistic for the NHS to have junior doctors...
Though the Tories want nothing more than to finish off their destruction of the NHS, they still need enough of the working age population to have sufficient health to be in the workforce. As things stand, too many people cannot access healthcare in a timely fashion, and have had to leave work, with consequent impact on the similarly vandalised benefits system, and the nation as a whole.
This is not remotely sustainable, and their plans to privatise healthcare will only exacerbate the problem. Reversing the damage inflicted is the only way forward.