Back when Apple was going bankrupt, Microsoft was on the edge of a Monopoly and decided to save Apple in order to keep competition and I don't think they expected Apple to get as big as it has.
Now I am not sure if the Ouya or even the Wii U can be considered competition for the Xbox and Microsoft, if Sony went under would Microsoft help them out like they did apple? Nintendo is on the brink of collapse too but they are holding on.
Doesn't Sony own Blu-Ray? The reason I ask is because I know that the XB1 can now play Blu-Ray, and at this point it seems MS has to make their games more compact so they don't end up having multiple discs in a case, and the only feasible way to do that at this point is to put them on BD like Sony does with their PS3 games. So wouldn't MS owe money to Sony for using BD?