I guess 2021 WAC football will be:

Tarleton State (x)
Abeline Christian *
Sam Houston State *
Stephen F Austin *
Lamar *
Central Arkansas * %
Jacksonville State %
Eastern Kentucky %

* former SLC members
% switch football to ASUN in 2022
(x) ineligible for post season play

Note: Southern Utah wont leave the Big Sky until July 1st 2022. Dixie State needs a year to unbind their schedule commitments.

In 2022 the WAC will be

Dixie State (x)
Southern Utah
Tarleton State (x)
Abeline Christian
Sam Houston State
Stephen F Austin
Lamar

(x) ineligible for post season play
Dixie State become eligible in the 2023 season
Tarleton State become eligible in the 2024 season

2022 ASUN football will be

Central Arkansas
Eastern Kentucky
Jacksonville State
North Alabama
Kennesaw State
(6th school unnamed)

Note: North Alabama will be eligible for post season play with the 2022 season, no waiver required.

The 6th school has almost certainly been identified. My WAG is a public school in Tennessee likely in the OVC. The Tennessee schools and trustee boards held firm over not playing; I suspect this is part of the reason for the later invitation.

Amazing development. But sensible, as both leagues will have their AQ status when they each start up.