There also is the G-League which is essentially the NBA minor league. Anybody on the bubble of making the NBA who wants a job will get a chance in the G-League, and if they were truly NBA caliber then they'd prove themself and get the opportunity.
I'm basically trying to answer this question: Is there a player who is talented enough to play in the NBA, but won't get that chance because the NCAA tournament is cancelled. The answer is no. If the player is on the bubble they'll likely get a G-League contract and if they excel in the G-League they'll get a shot in the NBA.
If they drop from the first round to the second round, they'll still get a chance. Obviously a good tournament or bad tournament might chance draft ordering and short term compensation, but the average NBA salary is ~7 million dollars. A million dollars here and there isn't going to make a difference if the player is truly NBA caliber.