On Thursday, the fourth board member - Mathata Tsedu - also resigned, the Presidency confirmed. President Cyril Ramaphosa has accepted the resignations.
All four have asked Ramaphosa to waive their three-month notice periods, lending credence to allegations by DA MP and communications spokesperson Phumzile van Damme that the ANC was interfering in the board's affairs.
It is alleged that there is an active effort to collapse the board after it reached an impasse with the government over looming retrenchments which the board maintains is inevitable, even if the ailing public broadcaster can get the multi-billion cash injection it desperately needs to keep the lights on and bills paid.
The wedge issue is the retrenchments - with Ndabeni-Abrahams echoing the popular position that no retrenchments should take place.
As it stands, the SABC needs around R3bn cash to try and right a badly listing ship. Bad management, worse deals signed with greedy sport clubs and a mess of corruption has led the SABC down a very slippery slope of financial disaster.
Critics of the board have claimed that retrenchments are only a small plaster on a massive wound, and won't offer any long-term solutions.
But even more crucially, the SABC has already had to come up with payment schedules for its suppliers and soon won't be able to pay any of its staff.
If serious intervention does not happen now, there won't be an SABC left to provide a single job.
In March this year, Febe Potgieter-Gqubule resigned to take up a position at the ANC headquarters Luthuli House as the party's elections general manager.
This is perfectly framed by the board's decision to undertake a retrenchment process despite serious criticism and even all three current and former communications ministers making it clear that this could not happen.
Obviously, this was never done and now salaries take up 43% of the broadcasters' annual costs.
In the past few days, News24 has been told that an active effort to collapse the board seemed to be under way. This includes the parliamentary portfolio committee's failure to fill vacancies and current and previous minister's reticence in stepping in to facilitate any sort of bail-out by the government.
Most recently, the fact that Ramaphosa accepted the resignations of Kweyama, Naidoo, Matisonn and Tsedu - which includes waiving their three-month notice periods - is a strong indication to SABC insiders that the president and Luthuli House are in agreement that the way forward is to try and get a new, more pliable board installed before the May 2019 elections.
Fortunately, the SABC board cannot simply be shown the door. Parliament has to take the decision, or the committee rather, to dissolve the board - must motivate the reasons for this, and furthermore hold an inquiry to determine the veracity of the issues.