I'm going to have to disagree with this. But since you already have quite a few people that disagree with you, I thought I might as well explain my views on the situation. I might be the only one, who thinks like this, but I would like to think I'm not.
So, I have to agree that playing with laggy people and people with high ping is no fun. I have been there, you have been there, all of us have. Hitting people like this can be really hard, visually it doesn't look nice, people can mistake it for hacking sometimes, all in all, not a pleasant experience. So from this perspective and a perspective of a person who has a good ping and internet connection, your suggestion seems logical.
But now you have to look at this problem from another perspective. From the perspective of a player with a bad connection and poor ping. Why do you come to CubeCraft? You are here to have a good time and play some games probably... And why do they come here? For exactly the same reason. Maybe Cubecraft is that fun place, those fun few hours a week, where they can go, casually play some games and just generally have a good time. They enjoy it as much as you do.
And now, you want to implement a rule/a system, which would effectively ban them from the server (if you have a bad ping you would always get kicked after 5 seconds). Believe me, those kinds of players are having no more fun playing those games with a bad connection. It's not fun for them either, but they try since they like it here. Imagine how you would feel if you got kicked every time you joined because you were too far away from a physical server? Imagine, how bad you would feel, that you can't play just because you were born in the wrong part of the world or you don't have the possibilities (financial or physical) to have a better connection?
I'll simply answer it for you. You will never have to know. But neither will anyone else. And that's because Cube is not about that. They try to help players as much as they can with dedicated servers in different regions, smart matchmaking and generally being acceptive to all (that follow the rules ofc). And we, the players should also follow that and show everyone around us, that we care for them, no matter what.
I'll end off by saying that you might not have had this in mind and you didn't want to hurt players like this, but sadly this is what something like this could bring. And something like this just isn't possible.
~LukaG_