Do you think the largest employer in the world doesn't need some sort of management? Do you think just a few would be sufficient for the entire country and all of the different settings? Do you actually have a clue of how many managers there are and their roles, or have you just been reading the daily mail?
The issue OP is multilayered, and it isn't all down to funding. There is a global shortage of nursing staff (possibly other HCPs too I'm not sure though), and it's no different here, many many unfilled roles. Even agency staff who get paid £££s are hard to find sometimes- so there are no quick fixes in terms of upping staffing levels which would make the biggest difference. Its a viscious circle at the moment- people leave because the workload is unmanageable due to being short staffed and then more people leave and it continues. What might help?
Better access to training. Even with student loans etc not many people can go back to being a student for 3 years (possibly 4 as many need an access course). Fees should be paid for and perhaps if you leave the NHS within x years you have to pay something otherwise you don't. Bring back diplomas and better bursaries.
Offer more flexibility in shifts- a lot leave as their situations change and they can't commit to nights/12 hour days etc. As they change this can be an issue as well, offer set shifts.
Improve the environment- free parking for staff and bus pass subs for those who don't drive, improve the staff facilities etc. Makes a more pleasant and appealing place to work.
Better community support so that less people misuse A&E as they don't have any other choice as they can't access any sort of care. More power to request time wasters are directed to the correct place for them.
Mental health ambulances and units (with at least x number of staff in a setting trained in physical health in depth too). The system for this is especially crap.
Plenty could be done but no government will have the appetite for it. I do think the effects of short staffing (let's be honest you can have all the facilities and kit but without staff it's pointless) will soon be catastrophic.