Yes.
It's great that those few games have made a boatload of money, but look at all the ones that have invested tens of millions and didn't even get their initial investment back.
How much money did MS lose on making those games?
It's a broken business model and without Sony there to push for consumers, I don't see a reason why MS would continue to aggressively invest for these experiences which are difficult to profit from.
You don't cut off your leg just because your hand is doing fine on its own right now. MS isn't going to want to go to its shareholders and explain a shrinking revenue base.