The towering Jamaican said he was only 50-50 about running at the next world championships in 2017 in London, and could retire at the Rio de Janeiro Olympics instead.
"After Rio, as I said, my sponsors want me to go one more year, but my coach said, 'Listen to me, if you're not going to be serious about going to the world championships in London,' then I shouldn't do it," he said.
Bolt, troubled by pelvic problems this year, was pushed all the way by Justin Gatlin in Sunday's 100m, but had an easier ride in the 200m as he beat the American by nearly two-tenths of a second.
It was the fourth consecutive world 200m title for the 29-year-old, who has won all but one world and Olympic sprint competitions since he lit up the 2008 Beijing Olympics.
"I probably should get my legs insured," smiled the six-times Olympic champion. "It was pretty scary when it happened but accidents happen."
Footage of the incident quickly went viral, with "Segways", referring to the electric scooter, trending on Twitter on Friday.
Some Chinese Internet users commented that the cameraman was the only person who was able to take down Bolt in Beijing.
"The only guy in the world who can defeat Bolt," a user with the handle "Sehun" posted on his Twitter-style weibo account.
