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“If even one player comes down with coronavirus, the [NBA] would suspend instantaneously because of the cascading effect of quarantines,” ESPN basketball reporter Brian Windhorst told me on Wednesday afternoon.

It only took a few hours for Windhorst’s prediction to pan out: On Wednesday night, the NBA announced that a player for the Utah Jazz had tested positive for the Covid-19 coronavirus, and that the league was suspending its games “until further notice.”

The NBA has suspended the season in the wake of the Coronavirus Crisis. Its official statement: pic.twitter.com/x3X6pddmSq — Marc Stein (@TheSteinLine) March 12, 2020

That announcement also adds context to a jaw-dropping scene that happened on Wednesday, when fans in Oklahoma City, who had come to see the Thunder play the Jazz, were told, 35 minutes after the game was supposed to start, that they should go home, without explanation:

What a scene. Game between Thunder and Jazz postponed with everyone in the stands. “You are all safe,” PA announcer says repeatedly. pic.twitter.com/1FOeLHYYC6 — Alex Kantrowitz (@Kantrowitz) March 12, 2020

All of which underscores just how quickly American reactions to the coronavirus are morphing. Things that seemed far-fetched or alarmist a few days or even a few hours ago are becoming realities.

And while the way the big-time sports leagues handle the pandemic may ultimately be a footnote to the way this story plays out, I can also see it helping to snap Americans’ focus to attention.

It’s one thing to debate among your friends, or strangers online, how worried we ought to be about the threat. It may be another thing to turn on the TV and see athletes playing in an empty arena, or games suspended or canceled entirely.

Which is where we are now.

A few hours before the NBA announced that it was suspending its games, the National Collegiate Athletic Association announced that its huge March Madness tournament, which features 63 games played over several weeks in arenas throughout the country, would be closed to the public.

Instead, NCAA president Mark Emmert said, attendance would be limited to “essential staff and limited family attendance.”

NCAA President Mark Emmert statement on limiting attendance at NCAA events: https://t.co/TIHHJjdse5 pic.twitter.com/8I1HdceDfN — NCAA (@NCAA) March 11, 2020

When I talked to Windhorst on Wednesday for this week’s episode of Recode Media, we discussed the notion that the NBA — which was already being compelled to bar fans from games in cities like San Francisco — might have to suspend its games altogether.

Windhorst seemed convinced that the league would end up forgoing its playoffs, which are scheduled to start in mid-April and finish up in early June. At the time — which, again, was a few hours before I started typing this — the idea seemed to me to be at the edge of possibility.

“I think it’s more likely that the NBA suspends,” Windhorst told me. “Specifically for the playoff games. I could see them keeping their head above water, taking some losses on regular-season games for a while. But I think eventually if this goes on, they will suspend and try to get all their playoff games in later on.”

Windhorst’s logic: Look at the way professional sports leagues in China and Italy, countries ravaged by the pandemic, had handled their games: They initially tried playing in empty stadiums and arenas, and eventually shut down altogether.

Windhorst, who has been covering the NBA since 2003, did have one hedge: “If a player gets sick, it’s the league shutting down immediately. But I don’t think it’s going to come to that.”

And, in fact, as Windhorst and I were speaking, NBA owners and executives were meeting to discuss their coronavirus strategy. Windhorst’s colleagues at ESPN reported that the initial plan was to play in empty arenas.

New story filed to ESPN:

The NBA’s Board of Governors shared a consensus on Wednesday to continue the season playing games without fans in arenas amid the coronavirus crisis, and Commissioner Adam Silver is expected to move in that direction with a decision on Thursday. — Adrian Wojnarowski (@wojespn) March 11, 2020

But now, in retrospect, it’s easy to see why the league would shut down once a single player tested positive for Covid-19. On Wednesday evening, players for both the Jazz and the Thunder were reportedly being quarantined at the Oklahoma City arena, and Windhorst reports that players for five teams that played the Jazz in the past 10 days are being asked to self-quarantine.

That is: Seven of the NBA’s 30 teams can’t play right now, regardless of whether fans are watching them. The virus forced the NBA’s hand. And we’ll be very lucky if that’s the most sweeping turn of events in the next few months, weeks, or days.

You can listen to my conversation with Windhorst below, at Apple Podcasts, or any other podcast platform: