A Kindle is cheap, efficient (battery lasts a month between recharges) and arguably better reading device. I'd carry one.

Now... You can watch movies and do Skype or FaceTime with your phone. The question is whether you need another computer (phone, phablet, tablet, laptop). Keep in mind that larger screens are very power hungry - unless you have access to the grid on a very regular basis, this becomes problematic. I'd bring a backup phone. Tablet/computer really depend on what you need. If you can manage without, good for you.

Instead of movies, you may want to consider podcasts. You can easily store hundreds of hours of audio on your phone. Netflix would require connectivity, which may not be readily available.

FWIW, we (my wife and i) usually travel with 3 smartphones, 2 Kindles, 1 tablet and one laptop. The tablet and laptop are essential because we must sometimes work under way. Never used for entertainment or touring purposes (ex. route planning). Charging these devices is a hassle