Is Mediumship a gift possessed by only a few people?

Absolutely not. We all have psychic abilities and we all can learn to develop our mediumship skills. However, some may be naturally more inclined to it, or have born with it. I like to compare it to drawing. I can learn to draw, but I am not going to be an artist. But there are others that are naturally gifted and with study and practice they become an artist.