The only major downside to a HotBot would be the team support heuristic for the player AI /teams of players. It's nothing that sc2 bots haven't done before, but they do need certain primers/logic to be able to pick up tactical awareness and choose between priorities for the match, wether to hold the lane, support the ranged, boost/follow the tank/healer, and to run back for health or to suicide, etc.
It's definitely doable, it just comes down to strategic methods /routines of play in assist based games.
Would probably buy it regardless.