If you love writing or making music or blogging or any sort of performing art, then do it. Do it with everything you’ve got. Just don’t plan on using it as a shortcut to making a living.
The only people who should plan on making money from writing a book are people who made money on their last book. Everyone else should either be in it for passion, trust, referrals, speaking, consulting, change-making, tenure, connections or joy.