It might also be interesting to subdivide the ATG card sets into, say,
ATG 7 - with a focus on the greatest teams for individual franchises and eras
ATG 8 - with a focus on great player seasons
The card sets don't need to overlap. The above divide, with about 80 teams in the ATG 7 set, would have somewhere around 2000 players, and the ATG 8 set could be pared down to about 2500 by (a) deleting the el cheapo roster fillers that rarely get used, (b) limiting the set to about 3 cards per player, and (c) removing most of the overlaps.