NBA is looking at late June as the earliest to restart. And since they were the first league to experience as positive, and the first league to act, they will be seen as the metric upon which other leagues act. This means the NBA and NHL will likely have the finish to their seasons in the summer through fall, take a month or two off to rest and heal, and then have a very abbreviated 2020/21 season.
Baseball will likely have to deal with a very short, 90 game or so season, which might not be the worst thing, but that sets us up for the potential for an bunch of underachievers and an over achiever taking advantage of the shortened season.
A lawyer in England familiar with the English Football Association has stated that they have until April to resume the current football season or it will have to be forfeited. World football, as a whole, I feel is done until next season, as their offseason (North America not withstanding) runs from May-August.
I think it's time to shut it down. Lockdown the entire country for all non-essentials for eight weeks. If you can work from home, you should. If not, the stimulus is in place to provide you wish coverage. There are too many people in Central PA who are treating this as a vacation and with the nice weather, are posting on social media about their activities, as if this is summer break. This is how this shit will spread. It's time to shut it down, and like Italy, issue forms to everyone who is not sick that authorizes them to go out for food, prescriptions, and essential shit alone. This isn't a vacation. That's how the decision to close the schools becomes rendered useless.