I don't think things will be just handed to Murray. Then on top of that they need a shooter playing next to him which Simmons is not... I still expect the Spurs to add a guard to replace Manu's 3 pt shooting in the bench. They have Forbes as a Patty understudy but I also expect them to get someone else just in case Forbes turn out not an NBA player.... just too many unknown factors for Pop to be comfortable about his bench guards as they are without Manu (and imagining Mills takes a lucrative offer + role elsewhere).
Without Manu and Mills, the bench is not going to be Murray and Forbes or Simmons for example. I expect them to add a veteran to that mix.