The China Professional Baseball League on Taiwan will open their stadiums to 1000 fans:

The China Professional Baseball League said up to 1,000 people would be permitted to enter ballparks from Friday after an agreement between the league and Taiwan’s Central Epidemic Command Center.

Other baseball leagues around the world were still suspended last month when games began in Taiwan in empty stadiums. South Korea’s league commenced this week, also without fans in the stands.

FoxSports.com

This will help provide an example to MLB on how they might bring in fans. I still believe that 3,000 to 4,000 fans, staggered seats and rows, is very doable.