I'd rather see everyone move away from Heroku than waste everyones time and money on the legal system, personally. The only ones who would win in a business class joint suit case would be the lawyers on both sides.
I think what Heroku did is wrong, but I still think class action suits are usually complete bullshit. The lawyers make off with millions or billions while distributing peanuts to the class action plaintiffs.
Inequitable money distribution aside, I think the bad press Heroku has received over this is probably enough punishment. I don't support how they handled this situation but the core problem isn't exactly that bad in the first place. Nobody died here, some companies simply had slow websites and to some degree that's their own fault, they should have done their own external monitoring if that sort of critical performance was that vital to them.