Domenico Scala announced an eight-part reform process, which includes a limit of three terms of four years for the president and the executive committee.
He said: "A number of issues have their root cause in the fact that people have stayed for far too long."
Sepp Blatter was Fifa president for 17 years before stepping down in June.
The 79-year-old, who will leave Fifa in February 2016, was in power for a total of four terms and was elected for a fifth before resigning.
Senior vice-president and executive committee member Issa Hayatou has been in place for 25 years with Spain's Angel Maria Villar Llona also an ex-co member for 17 years.
Swiss-Italian Scala was set to be appointed as head of a Fifa taskforce set up to tackle corruption following the start of two ongoing criminal investigations.
But after questions over the independence of the reform process, former International Olympic Committee director-general Francois Carrard was assigned with the role.
After delivering his proposals, Scala, who has acted independently and wants Carrard's reform panel to adopt his ideas, also said: "If Fifa does not move, public opinion will not change.
He added: "I made it very clear when Mr Blatter laid down his mandate that it was not only about the change of presidency but that there were certain systemic issues that need to be addressed.
"We need reforms now, we can't wait. Fifa works very well operationally and has not come to a halt. But this is a watershed in terms of role and perception going forward."
In addition to term limits, he announced plans for:
The development comes after Prince Ali bin al-Hussein of Jordan said Fifa "must overcome deep-seated corruption" as he announced he will stand in the Fifa presidential election.
Uefa president Michel Platini has also declared that he wants to stand for Fifa president.
Former Fifa executive Chung Mong-joon of South Korea has also indicated that he will run in next year's election, as has Liberian FA president Musa Bility.

Care Quality Commission (CQC) inspectors rated almost every aspect of care at Sunderland's Hylton Medical Group as "inadequate".
The group, which operates two sites for 5,240 patients, came out of its first spell in special measures a year ago.
Clinical commissioners described the rating as "disappointing".
Alison Holbourn, deputy chief inspector of general practice at the CQC, said: "We found that people were not getting the high quality of care which everyone should expect to receive from their GP.
"Following improvements at a previous inspection in April last year, the practice has been unable to sustain these and they now return to special measures.
"We remain particularly concerned about the effectiveness of the service the practice provides to patients."
Ms Holbourn added: "There were no audits taking place, so staff had no way of knowing if the services provided to patients were improving their outcomes.
"Following this inspection we also found fresh concerns around leadership. We weren't confident the practice was providing effective clinical leadership or that leaders had a comprehensive understanding of the practice performance.
"I do not believe that the practice is likely to resolve its challenges without external support.
"Where necessary, another inspection will be conducted within six months and if there is not enough improvement we will move to close the service and remove the provider's registration."
David Gallagher, chief officer at Sunderland Clinical Commissioning Group, said: "It is disappointing the practice has received this rating, but we continue to work with NHS England and other partners to help the practice team tackle the issues that have been raised and make the necessary improvements.
"Patients at the practice can continue to use the service in the usual way, and we would encourage anyone who is concerned about the report to contact the practice."
Fifa's corruption problems are a result of officials staying "too long" in key positions, according to the governing body's head of audit and compliance.
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A GP practice has been warned it could be closed down after inspectors placed it in special measures for a second time.