If clubs kicked people out before they were drunk, then they wouldn't serve fishbowls at any of them, or allow only 4 people per bottle of liquor.
Having said that, if you are drunk enough to be viewed as a liability, they will not hesitate to ask (tell) you to leave. My 25th birthday was a week long extravaganza in SoBe. By Saturday, my actual birthday, I was exhausted. We were at a popular nightclub ordering bottle after bottle of champagne.. champagne is dangerous for me because you don't feel it right away, but I admit that I love it. After 4 glasses I was so tipsy and so tired.. apparently I started to fall asleep at our table. The bouncer saw my head nod, and immediately came up and told our group that I had to leave right that second. Extremely embarrassing.