Blockwars isn't really as popular as any other games, like take mineware for example. (Around 9 blockwars players against around 20-30 mineware players at low peak times. During high peak times, at least around 30-50 blockwars players against 100+ mineware players at high peak times.)
Sure, a few community members on the forums want it to be added, but keep in mind that there is a still a good-sized community on the server rather than on the forums that could either want blockwars to be added or to be removed.
what? I played 14 hours every day and in most of the time blockwars had more players than mineware.
Tower defense had 160 players, block wars 110-130 players and mineware 80 players, that's what I saw in the 10 days that was blockwars.
In addition, when mineware returned as a permanent game, the blockwars player base was not affected by mineware, on the contrary, blockwars had more players, so the blockwars community is bigger than mineware, mineware is fun yes, but after 5 games it is bored..