They are actually more durable today then they were ten years ago thanks to modern technology that has provided the means to scale them down and make them more durable.
We are simply as a society far more connected to the virtual world than we ever have been, most people that opt for laptop computers do so because they want to be able to be in any room or any location for that matter and use their computer.
Pricing has come way down, to the point where it is one fourth of the price it was ten years ago (and in some cases less than ¼) to purchase a brand new laptop computer.
They are cost effective and widely available, they can be purchased online or through traditional retail outlets, each year sees them coming down in price! Processing also plays a huge factor in the craze.
Ten years ago laptop computers were more of a complement to a desktop computer; today they can do everything that a desktop can in the same amount of time! It looks like laptop computers are definitely here to stay, they come in so many different options, they are affordable and they are super convenient, it won't be two long before the desktop is a thing of the past and is considered an ancient form of computing.
As time passes and laptop computer become even more advanced there will simply be no reason to be tied to a desktop computer.
Just make sure to do a little research before you purchase any type of computer.