"The body of clubs over the last two or three weeks have made very difficult and courageous decisions. I salute them," Mitchell said. "They now need to make one more: they must recognise that Scottish football can only support a limited number of full-time clubs and together agree to find a formula, without self-interest.
"The Swiss FA did just that. It's a case study that can be learnt from. They also have an excellent youth programme.
"The people at the Scottish Football Association and Scottish Premier League who said this was not viable must do the honourable thing and resign. Their members do not believe them."
Mitchell held Doncaster's position as chief executive of the SPL from 1998 until 2002, after Rangers and Celtic vetoed plans for a league-owned broadcast organisation. In an exclusive article for The Herald on the eve of yesterday's vote, he described the SPL as a "14-year error of judgment" that would be killed off by the five-month debacle that concluded with the decision to place Rangers newco in the third division of the Scottish Football League. He believes the departures of Doncaster and Regan, his counterpart at the SFA, must now be part of wider changes in the Scottish game.
Mitchell was critical of the predictions made by both administrators that refusing to make a special case of Rangers would cripple Scottish football. He added: "This is the best solution for Rangers and maybe, just maybe, it is the catalyst to reboot Scottish football. Rangers will come back stronger and more credible."