What does 1 Corinthians 12:30 mean?

Paul is asking a series of questions to which the obvious answer is "no." He seeks to drive home a point: that all spiritual gifts are needed to serve all the functions in the body of Christ. As pointed out before, the body cannot be made up entirely of eyes (1 Corinthians 12:17). There are innumerable things which must be done, which an eye simply cannot do. That's why not everyone is an apostle or a prophet or a teacher. Not everyone can do miracles.

Now he asks if everyone has gifts of healing or the ability to speak in or interpret speaking in tongues? Of course not. If that were the case, the church in Corinth would not be a church. A pile of eyes is not a "body." All spiritual gifts are needed, and all those diverse members have an important role to fulfill in the health and success of the church.