Fine, but why do you switch only the lowest player? I think people are mostly disconnecting when they are in a weak team (and can not frag), so you switch a weak player in a weak team, after some rounds he will disconnect too.
After the low player switch a better player can join the better team (and he will join the better team, good players join mostly the better team).
The server teams will be unbalanced in players skill.
Or am i wrong?