Managing means getting along with both the expected and the unexpected. Pini is on the one hand asking for "carreer ending injuries", to make the game more realistic, on the other hand he´s against a (pretty realistic) unpredictable factor in the GS part. Pretty inconsistent. Can´t fight the feeling he´s asking for a change just because.
I don´t see any improvement in the suggestion over the current system, as I do think that some parts of the game should be both within the managers hand AND beeing to some degree unpredictable. In the end, you can go GS training if you want to make sure. If you do, that´s a management decisiion to do so, as it is if you don´t. Sacrifice training time for GS? Management decision. Those choices are key to BB imho, and the more you make this a "press green, press pink press yellow - win!" game, the less fun it will be, as EVERYBODY will do it.
Getting different ways, different approaches, strategies, different DECISIONS a fair shot on winning is what managing is about. In my world.
GS is on the positive side of that equation of things increasing difficulty while yuo have all the tools you need to manage it at hand. Leave it as it is.
Zwei Dinge sind unendlich, die Dummheit und das All...