So how are junior doctors going to cover weekend shifts without employing more of them? They already cover A & E, maternity, intensive care, etc. If they are also going to cover outpatients and non-critical care at weekends, the simple logistics means that there will be fewer of them during the week. Lack of consultant cover is a bigger problem, but junior doctors are an easier target, because they have renewable contracts.
In any case, they can't do their job properly without also employing admin and support staff, such as phlebotomists, radiographers, pharmacists, etc, so the next step will be to change their contracts too.
Increasing numbers of NHS roles are being outsourced to providers who cut corners, not only with the pay and conditions of staff, but the care they provide. That's what this is really all about.