I don't think they're necessarily spreading themselves thin. Given work has been underway on Orlando, and presuming they have already funded the line's completion, there's no reason they can't do both. They're popular enough that Aventura and Boca want stations, PortMiami looks to still be happening even without Virgin, and it looks pretty likely they're getting the commuter rail contract over Tri-Rail. Unless they were already in severe danger of insolvency even before the pandemic, they'll probably be just fine.