Looks like the same scenario as with Microsoft overtaking Nokia. If you haven't lived under the rock for the past few years, you could probably notice that Unity is in a deep crisis now, since the advent of UE4 and it's indie-friendly business model. Riccitiello is a typical crisis management guy - he gets into business in its difficult times and makes it profitable again. But on the stairway to profitability lots of unpopular decisions are made - and ultimately, company's image gets ruined. It's difficult to blame David for his decision to step down and exit into cash - for the last couple of years the stress had surely become unbearable enough to get him a pair of deep permanent circles around eyes. But it still ceases to amaze me how history keeps repeating itself, with all these business talks trying to save the ship and prevent rats from fleeing.