It could cause a serious impact to his play next season as a rookie pro. When it comes to his entire career it won't be a huge deal. But, the worst case scenario could have a significant impact to the start of his pro career if he gets COVID there, has to isolate in a hotel room doing nothing and probably not getting great medical care, and then has lingering effects that linger through this off season and perhaps into next season.
For example, there are people that didn't want Rossi in an Eichel trade because of the lingering effects of his bout with COVID from last season.