The format has been set, and MLS appears to have won the compromise.
MLS, U.S. Soccer reach U.S. Open Cup compromise - The Washington Post
U.S. Open Cup revamp to feature just 8 MLS first teams - ESPN
MLS Clubs Participating in the US Open Cup 2024, Including NEXT
11 MLS NEXT Pro and Eight MLS clubs will participate in the 2024
FC Cincinnati won't have a presence in the 2024 U.S. Open Cup
Report: Arsenal eye Columbus and USMNT goalkeeper Schulte
19 MLS And MLS Next PRO Clubs To Compete In 2024 Lamar Hunt
Opinion: Don Garber's US Open Cup howler
US Open Cup 2024 TV Schedule USA - World Soccer Talk
2024 US Open Cup Round 1 Preview: 109th tournament kicks off with
U.S. Soccer rules MLS teams must participate in 2024 U.S. Open Cup
St. Louis City SC fans to boycott over MLS' U.S. Open Cup move
Why did MLS withdraw from 2024 US Open Cup?