Should the Gospel be in Every Sermon?

I've had some pretty intense conversations lately as to whether a preacher should be expected to preach the gospel during his sermon. While some seem to believe it is safe to neglect a gospel proclamation, it seems to me that this is poor preaching.

I found it interesting that after having this conversation, our elders began their study in Romans. It seems obvious from the first chapter of Romans that Paul wanted to visit the gentile believers in Rome, that he wanted to preach to them, and that his content he wanted to preach was the gospel.

If that is not enough to remind pastors that the believers in the congregation desperately need to hear the gospel, D.A. Carson also offers this thought (in his message, What is the Gospel? from the Gospel Coalition Conference):

Perhaps more common today is the tendency to "assume the gospel"...whatever that is, while devoting creative energy and passions to other areas. Marriage. Happiness. Prosperity. Evangelism. The Poor. Wrestling with Islam. Bioethics. Pressures of Secularization. Dangers on the Left. Dangers on the Right. The list is endless.

But this overlooks the fact that our hearers inevitably are drawn toward that of which we are most passionate. Every teacher knows that. My students are unlikely to learn all that I teach them. I've resigned myself to that for a long time. They are most likely to learn what I am excited about. If the gospel is merely assumed, while relatively peripheral issues ignite our passion, we will train a new generation to down play the gospel and focus in on the periphery. It is easy to sound prophetic from the margins. What is urgently needed is to be prophetic from the center. What is to be feared, in the famous words of T.S. Elliot, is that the center does not hold.

Moreover, if in fact we do focus on the gospel and understand it aright, we shall soon see how this gospel, rightly understood, directs us how to think about and what to do about a vast array of other kinds of issues.

Where are the pastors who echo with Paul:

For if I preach the gospel, I have nothing to boast of, for I am under compulsion; for woe is me if I do not preach the gospel!--1 Corinthians 9:16