I agree.
As of about 2 hours ago, there were 44 confirmed players who have opted out who were actually on NFL rosters. Assuming 80 man rosters per team, that's 44 out of 2,560 possible players (its likely higher than that actually). That's an opt out rate of ~1.7% currently. Not a very big number at all.
Here's what I really don't know... how many players in an individual locker room would have test to positive in order to prevent a team from fielding a roster that week for a game? Considering you have essentially 60 man regular season rosters (48 on active + 12 PS), and this year offers a ton of flexibility to go back and forth, unlimited IR spots, etc., how many players would you really need on gameday to compete?
If you truly went bare bones... probably like 35-40. Have a lot of guys playing special teams that normally wouldn't, but you could actually field a team, without major concerns for well-being, with about 35-40 players.
So realistically, in my eyes, you're going to need about 20-25 players to test positive at the same time, and be ineligible to play, in a single locker room, before you really have a "problem".
Other than that, if they're able to contain like 3-5 players getting it, regardless of whether they're big names or nobodies, they'll continue on. The NFL isn't going to cancel its season because Lamar tests positive and misses 2-3 games. Its going to take dozens of players across probably multiple locker rooms, at one time, who test positive, in order to halt the season.