My feelings on TC are well-known by now, so I won't repeat myself.
My feelings as to what is gonna happen is this as of now :
HK3 stays open. Of course.
HK4 will be. While it won't be all too useful now, it will be someday. Better be safe than sorry.
Why won't it be useful NOW ?
Well KR will see the day. People will fucking rush to it, especially since summer is about to end. KR will overflow.
K1 which is almost dead will shortly be replaced by KR1. This will be the final step for K2.0 and I will then release pruned maps with manageable size for nostalgics to download. (People who wonder what happened to the old map will then realise.)
First two and last two servers are gonna get linked through qCraft portals in pair.
I expect KR to be semi-short-lived and rather intense while HK will get a long hiatus while Greg works on stuff.
As GT6 becomes more complete (and the pack as well.), people will slowly get back on it.
KR will then die slooowly... As in excruciatingly slowly. And that's about as far as I can see.
A TC containing server could possibly open as a fifth slot for a short time, as I know the server can handle it well. (We've had 5 maps for a while, you just never seen the fifth one.) This would be vanilla stuff. If it ENDS UP being popular, we'll see. I doubt it'll see that many users though.