It's good stuff, I'm itching to preach it, but it's not organic to the body of the sermon. Finally, there is no such thing as a generic conclusion. A great conclusion, like fine gravy, is made up of the same essence as the meat. Anatomy of a conclusion A great conclusion is pithy, personal, and persuasive. Compared to the length of the body of the sermon, a conclusion is relatively short.
Brevity has immense power.
I don't want the conclusion to sneak up on anyone, but if it drags, people will not stay with me to the end. That's what I'm after. I believe the whole intent of preaching is to draw people to a decision. I watch my people and listen for the Spirit, even as I'm speaking. The conclusion represents the highest emotional peak of the message, because I want to motivate people to do what they've just been informed about.