Bots would not do public games because of shared loot=playing solo has more benefits. So less chaos and baalruns, it would be issue for current d2, probably wont be issue in D2R because there will be plenty of players who are capable of doing baalruns.
Since all drop is distributed to all players, your chance to get loot is significantly lower, meaing you are not the one who will make sure how much you will get. You are at mercy of ploot system hoping you will get something. This will lead to people creating games for less players. If you can MF run as 3, why would you invite other 5 to share loot with more players?
If you can do chaos run in 7 players, why would you make game for 8 players and share with one more person.
For me is ploot antisocial feature and it will force people to crate games for less players. You might get same number of loot in long run with ploot as with FFA loot, but people feel much better when they know they actualy can pick up all what drops, not what was decided by automatic system. It doesnt matter you will not get all loot in FFA, the point is you can.