I just finished a match on Terminal. We had six players at the start of the match, but they disconnected a few minutes in. My team and I spent the rest of the game shorthanded three players with no one on the opposing team willing to swap over.
I think Splash Damage should award any player who swaps over to a team with fewer players to even it up. It would have to be on an hour long cooldown to prevent abuse.
At the moment, none of the servers have any kind of automated team balance and with no server admins in sight. There has to be something that can be done about this issue.