If I could make that decision, looking at City and Chelsea, I would say no everytime.
Cant speak for every fan, depends how desperate for success they are. Chelsea didnt really need Roman, they just needed someone to sort the clubs finances out. I would say if the Chelsea thing never happened, there would be more teams genuinely fighting for the title, Chelsea included and a much more level playing field for everyone else. Forget about our clubs for a second and think about the effect on smaller clubs. They basically have no say in the market now, no control over their players. They have suffered badly in this and it will continue.
Say Chelsea had never got Roman but had got someone in who took the club off bates, cleared the debts and you carried on as you were before Roman. I think you would of won the league in that time, had similar CL success and domestic cups would of been fairly common. If you looked at City now, and lets fast forward 5 years and imagine they have completely cornered the market off, all other clubs, Chelsea, United, Wigan, Burnley whoever are literally fighting for scraps, exactly like La Liga. Would you want to be like City, or would you prefer it was stopped and the playing field evened out again so that clubs had to earn the right.