This is an interesting question. I have read many books that were less than one hundred pages and books that were over three hundred.

In my personal experience as a writer, I can't write less than one hundred pages. The words in my head flow so fast and to be honest, if I'm going to ask for a price above a dollar, I want the reader should to have something to read.

I do admire authors who can write short stories, I just can't.

So should books be shorter nowadays? Maybe but as long as I'm writing, mine are going to be a full novel. That's just how I roll.