The problem is that, for the most part, it’s about 50 years out of date.
These days, when you want to do some research about a travel destination, where do you go? Increasingly, it’s the internet and what we look for is reviews by other visitors. I’d be willing to bet that the sales of the traditional travel guidebooks are declining, maybe moribund. Soon you’ll automatically turn to your iPhone for other portable device.
By the way, there are also
people out there trying to tell you that you can make a lot of money
snapping travel pictures (if you buy their course). Wrong again--if anything, the outlook there
is even worse than for travel writers because it's so easy now to get
stock photography literally for pennies--some publications even lift
them off flickr for free. (I get many of the photos and graphics I use on this blog from clipart.com, with unlimited access for an annual subscription of around $160. These are low resolution images, fine for online use; higher resolution versions for print publication have to be bought individually.)
However, if someone tries to tell you that starting out now as a travel writer or photgrapher is an easy and profitable path, get yourself a very large grain of salt.
(You'll find more 'tell it like it is' advice on writing in my book, "Your Writing Coach," published by Nicholas Brealey and available from Amazon and other online and offline retailers.)