In competitive game ?Hell no.In 10 vs 10s where players drop like flys i see it as decent solution but in a 3vs3,4vs4 Ranked/Tournaments games it would be a dissaster imho.
In W:RD cash to win tourney we played "losers bracket final" games and in the first game i dropped and my teammates Firestarter and Razzmann won 2vs3,i am pretty sure we would have lost if i was replaced by the AI.Its just an example but i am pretty sure all the teams that are playing Tourneys or Ranked would rather play without the AI filling the holes.