I'm assuming, yes. Plus, since most positions have negative WAR players among the bottom 5 or 6 players at each position, one could argue there are several MLB players playing below the level of replacement.
We were just talking about dWAR and defense, though, and I'm assuming there are a ton of minor league players that are excellent fielders but never make it to the bigs, because they can't hit. It's hard to know what a "replacement level defender" is, because it doesn't really make sense. Are we talking about the average defensive skill level of AAAA players?
The worst players are below replacement level, if their WAR is below zero, and there are many starting players below zero right now.
It takes 180 PAs to get to 270 "qualifying" players (30 teams x 9 starters), and out of the 270 players on the list, 64 have a negative WAR and 70 are at 0 or below.
According to fangraphs, 148 player have a negative dWAR, so maybe they set dWAR with zero as average not replacement level.