I loved old skywars too, but sadly the plugin we used (and what maked it great) is no longer updated for latest minecraft versions.
We also already have plenty of gamemodes, adding more might make it "to much"
Skywars would def be a plus one but like leon said you're just spreading more players out on more servers, effectively making those servers less popular. Although some players might come back and play skywars, I think the server needs more players to start consistently playing before all that $$ spend on wam, and all that time.
Foxcraft is a network that consists of multiple classic
gamemodes like Kingdoms, Skyblock, Survival, Creative,
Prison & more. All of these gamemodes have custom
features that you won't be able to find on any other
classic gamemode server.