"The World Tour -- it's going to happen one day and I think it has to," McIlroy, who failed to qualify for this week's Tour Championship in Atlanta, told the "No Laying Up" golf podcast.
"To have all these tours competing against each other, and having to change dates, it's counter-productive. I think everyone has to come together, added the 28-year-old, who claimed the FedEx Cup title with victory in Georgia last year.
"The easy thing would be for the PGA Tour to buy the European Tour and take it from there. They could still run the European events and we'll have, say, 12 big events a year, outside the majors, a bit like they do in tennis.
"I don't see any other way. I know discussions have taken place, so maybe one day."
Hampered by rib and back injuries all season, McIlroy had planned to take three months off at the end of the year to recover full fitness but confirmed his participation in next month's British Masters and Alfred Dunhill Links Championship.
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by John O'Brien)
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