Replacing rice by potato in a diet can have many advantages like combating obesity, keeping diabetes in control and improving the overall health of the population.
Of course, the way of cooking the potato matters; fried potato chips for dinner would not be really beneficial to the health. :D We'll now have to learn several derivations of the mashed potato recipe and I guess eating homemade stuff would be more appropriate from now on.
Initially it might be hard to give up on rice but in the long run you'll get used to it. It's a personal experience; I'm about to celebrate my third week without rice. Yayy!
Finally, if you see a future of potato-eating quite gloomy, there's still breads and our irreplaceable faratas.
Now let's just leave the rice for rare briyanis and fried rice and let's adopt the potato (not couch potato) attitude.
Aah! So long dudettes and dudes and my conscious aliens. I'm off to cook some potatoes.