Aishwarya was replaced by many because Salman created a ruckus, instead of standing up to the actress, many including SRK and Yashraj choose to not work with her.
Rani and Aish were friends, and the problem was that Rani chose her own career than supporting Aish. Professionally there was nothing wrong in Rani doing those films, it was a golden opportunity for her and she grabbed it. Rani also was very close to the 3 Khans.
Things turned sour between them and especially after Aish became Bachchan bahu. Once Rani became Yashraj bahu, they could not cold shoulder her anymore and now they are all cordial with one another.
It would probably be a different scenario if they were not married to such powerful families.
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