First of all, leave aside that there's no monetary reason for WiS to expend assets tinkering with its games, unless it intends to recruit new users.
Certain elements of real life aren't going to work in a game because they're more easily manipulated without real life conditions. The 10-Day DL is already being - no one's calling it "abused" yet - by major league teams. There was an article a couple of weeks ago that the Dodgers are for all intents and purposes using a seven-man rotation by shuttling their rickety SPs on and off a week at a time.
I would bet that MLB is monitoring 10-Day DL use closely, and if it's abused, will consider rescinding it in future.