Every NFL Draft has a direct impact on veteran players. For every rookie who makes a team, one fewer veteran of at least one season will fail to make a roster. When factoring in college free agents, that amounts to hundreds of players every year. Last year, for example, the Pittsburgh Steelers had eight rookies on their initial 53-man roster, and that is probably on the low end league-wide, or at least in the mid range.
But the 2020 NFL Draft will affect at least one class of veterans differently than normal: specifically, any veteran player who has agreed to a contract or has been a part of a trade that has not been finalized will now be at risk of having his deal terminated before it is ever consummated.