I don't think so. At high level games, most of the time an AI means a loss because the AI isn't all that good at coordinated attacks, flag locking logical targets, going for portals, etc. But even if the AI wasn't there, you'd still be 3v2, and at a high level of play, that should mean you can't possibly win.
My solution, though it sounds unfair, would be to keep the lousy AI, but make their deaths worth 0 EXP and 0 gold. Then, if they die, its not as bad for the team stuck with them (and I'd think that would end any argument you have about removing AI completey).