I've always written what I like to read, and I think most writers do the same, and if they can follow a trend, then usually it's all the better. Right? I'm not so sure.
The one thing I found is that too often the market becomes flooded with writers hoping for a chance to get published once a genre becomes popular. I'll hear writers claim that paranormal fiction (or YA, fantasy, etc.) is currently big, so that's the genre they're going to write. The unfortunate part is that every other writer has come to that same conclusion. This usually means writers are competing against all the other writers that had that very same thought, thus diminishing their chances of getting published.
This isn't to say that you won't get published if you've written in a genre that is currently experiencing a rise in popularity, I just think, in my limited experience, that your odds are greatly reduced since the competition is great. After all, if an agent has his/her choice of two hundred vampire, young adult romances, what are the chances for your vampire, young adult romance?
Obviously the ideal situation would be to write in a genre just as it starts to experience a rise in popularity before everyone else catches on.
What are your thoughts or experiences on the matter? What genre do you currently write and have you given other genres any thought for the sake of a better chance at getting published?