I don't think it's a quesion of how hard it is. Most anyone can write a novel, I think true talent is shown when the novel that you complete wants to be read. It's so hard to catch peoples interest in today's world. You have to be interesting, concise, witty and imaginitive. Creating a world that people want to be part of is much harder than "writing".
That being said I do think good writing is an art, not a gift. It can be taught and honed and with enough dedication it can be mastered.
So I believe it's not hard to write a novel. It's hard to write a good novel that others want to read. It takes an amazing amount of dedication!