Problem here Shaunna is money and also land availability as to hire a track is extremely costly and to setup facilities such as Rossi's ranch is ridiculously difficult here due to various minority groups who oppose everything that does not suit their aims (personal experience with a mate who tried)
As for CS/MD, I do recall Stoner having been helpful to some younger riders when he raced (accomodation, advice and his push for equal rights in the paddock), but now as he is not full time he wants no involvement and all well and good there. As for MD, well he hast he money but his interests are now of the aviation variety so probably has little time.
I do know that Bayliss does some coaching from time to time and that McCoy (the oft forgotten man IMO) does some coaching and has tried a small academy type of setup, but has issues with cost and facility as he did not make the millions out of the sport that others have done.
And it is for these very reasons why Rossi should be applauded (IMO) as no matter what we may think of his riding, his championship or his personality, the fact is he is putting his money to good use for the younger generations of the sport.
Edit.
I feel weird, dirt kind of weird .............. what am I doing writing positive thoughts ................ no, I need the inner hater to return