Not enough players to play most of the old servers. With a small player base numbering aroung 100ish, it would be difficult to have 8 Races and some of the large maps. No chance of doing AF (I have the MVM map), CW3-6 need more players. CW2 was fairly compact, but had the Feds in the middle surrounded by the other races in a sort of Pie fashioned heptogon OK then with lots of Feds probably not now.
If I had to choose one to scale down to existing Player base, it would probably be Rogue Jedi's, It suffered from OP coming out and the schism in the community, most going off to play Rooks Tavern One. It was a trad set up, with simple VCs, great map, few rules, and was sadly underplayed. Good one RJ!