I don't see King of the Hill as necessarily bad. I do agree that the smaller guilds that generally idle in Snowtown fort will have a bit more of a time holding the tower (Get more people to idle! - kidding).
We chose these towers specifically to introduce King of the Hill (KOTH).
-Snowtown: Pretty much a dead fort. Every time I stop by there, I see 3-5 players, with around 2 of them being idle. It has a big flag room to allow for big guild fights.
- Graal Castle: A busy fort, but has a big flag room as well.
Both have extremely easy access to get into the flag rooms. There's no "defense" like MoD, Sardons, Deadwood, etc. have. Smaller guilds generally shoot for these towers anyways due to small pathways that can be easily blocked. Towers that are easy to get into the flag room generally have guilds that spam noob members to sit in the room to keep the flag.
KOTH is really no different than before. If you are a "good at PKing" guild of 5 members, and are attacked by 12 "noobs", I'm going to assume that your 5 members can easily clean the mess up. You also still re-spawn in the room, giving you that advantage as well.
I think this will also help guilds in the long-run be more Active. You can't take Snowtown or the Castle with only 2 people. You'll need an active, loyal, group of folks that will get to the tower when you say "go", and will stick around to defend it with a large guild count. A lot of guilds, from what I see, are currently being used to show pictures of yourself while you spam people to "RATE ME!" - not really the intended use of the guild system.
Change is hard to accept, but I think you guys will find KOTH really a nice alternative option to the standard "bash your iPod as fast as you can while standing next to the flag".