Jimmy is exactly what this team needs. The template of generating offense by perpetually running Steph off screens for open shots or forays to the bucket has come to the end of its useful life because the key pieces have gotten old. Steph just can't convert enough to beat the best teams with the quality of defenders he consistently has chasing him. He has to shoot his 3s too quickly and his layups with too much english to be efficient.
The new offensive framework will be built around Jimmy's midrange and paint scoring causing the defense to sag which will allow Steph to get just that little bit more open. It will pay big dividends.
The other player that will benefit is Kuminga. Largely because Jimmy will become a mentor of sorts for him and Kuminga will develop his game with Jimmy as a template. Kuminga will also be one of the main beneficiaries of Jimmy's passing with many easy shot opportunities and layups resulting.
The guy that may have to recede into the background on offense somewhat is Draymond. But I imagine at this stage of his career, he'll put his ego aside and recognize the necessity of it for the team to win. He might even go to the bench to take the expected Kyle Anderson role(

What I'd like to see:
Curry/Podz
Moody/Hield
Jimmy/GP2
Kuminga/Draymond/Gui
Post/Loon/TJD