LOS ANGELES — Fissures revealed by the hacking at Sony Pictures Entertainment have raised the prospect of profound change at one of Hollywood’s oldest institutions: the Motion Picture Association of America.

In a behind-the-scenes drama, the Sony Pictures chairman, Michael Lynton, last month told industry colleagues of a plan to withdraw from the movie trade organization, according to people who have been briefed on the discussions. He cited the organization’s slow response and lack of public support in the aftermath of the attack on Sony and its film “The Interview,” as well as longstanding concerns about the cost and efficacy of the group.

Reversing course in mid-January, as the Oscar nominations were being announced, Mr. Lynton stayed in. But he and other studio executives are now discussing proposals that could alter the structure, mandate and governance of a 93-year-old organization that has been the policy front for Hollywood’s major film studios.

If adopted, their still emerging propositions might jolt the group into line with the new realities of a changing entertainment business. They might, for instance, open the association to new members and expand its interests to include television programs or digital content. They might also reduce the heavy annual contribution of more than $20 million that is required of each of the six member companies: Walt Disney, Warner Bros., Paramount Pictures, 20th Century Fox, Universal and Sony.