The showpiece T20 event is scheduled to take place in Australia from October 18 till November 15.
Warner's pessimism is borne out of the massive logistical challenges in hosting the 16-team event, especially as the deadly outbreak continues to firm its grip.
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"The ICC World Cup will not go ahead here by the looks of it. It will be difficult to get everyone (16 teams) together," said the Aussie opener during an Instagram live chat session with his Indian counterpart, Rohit Sharma.
Rohit, on his part, said it would a great way to restart international cricket via India's scheduled Test series in Australia in December-January after the T20 World Cup.
"I love playing against Australia. When we won last time (in 2019), it was great for us. You guys (Warner and Steve Smith) were missing (due to ball-tampering bans)," he said.
"What our bowlers and batters did there was amazing. I am looking forward to the upcoming tour already. Hope both boards manage to get the series underway. Will be a great way to kick off cricket in the world."
Virat Kohli's men created history by winning a Test series down under for the very first time in the 2018-19 season, which for Warner was a terrible experience sitting at home.
"Watching that series was hard as you can’t do anything from the outside," he said. "But I want to say that India has the best pace attack against left-handers. They zero in one spot and keep bowling there."
"Mentally, it was great for Indian cricket but it was hard to watch. I felt helpless. Hope it does happen (again) and looking forward to the battle."
(Inputs from PTI)