Depending on the results of the last game of the season in each D3 league, there will only be 1 to 2 auto promote spots available to D3 unless more teams go bot before the end of the season. At 20-1, it will be almost impossible to get the auto promote spot.
It will be especially harder this season, since three teams that I know of in II that went bot have been replaced with new users, so instead of autodemoting to V and opening up three more promotions to III and IV, they'll just relegate to III normally.