The number of huge franchises they aquired is too big to not make in impact once the games start to roll out of it..
It's always "next year game will be a turning point"
You know nothing about extrapolation, do you?
The problem with Xbox installbase is that acceleration of sales (second derivative) is negative and stayed there for a long time and there is literally nothing on horizon that will change situation - all MS decisions and game output so far ensure that 2nd derivative will stay negative and console will sell less and less each year