Kimoto Gravity Well is an idea that has emerged and been refined as
pseudo-scientific gibberish by people who have no clue what they're talking about.
Please don't waste our time with things like this unless you understand it thoroughly yourself.
What? The algorithm has been successfully implemented in several altcoins that had trouble with multi pools. It's not "pseudo science" just because it has a fancy name attached to it. It's an implementation that does its job.. what else is there to say about it really? Kimoto did a good job solving Megacoin's issues, and other devs adopted it for the same reason: it works.
I was involved with Anoncoin some time ago, and they had similar issues as Megacoin did. I suggested the dev take a look at Kimoto's solution. He did and after having a look at it decided to implement it. Problem solved. Since then others have gone the same route.
Note that I'm not saying that Bitcoin should implement it. I'm just saying it's not pseudo science, it's a solution to a problem.
KGW works for alt-coins because of the existence of multipools and similar constructs, causing the network hashrate to drop by more than half at any given moment when the multipools switch to another coin. For a coin with a hashrate that is either increasing or decreasing in a relatively smooth way, KGW has no added benefits. And Bitcoins hashrate is currently increasing and even if it would decrease (if marginal costs of mining outweigh the income), it would do so in a smooth way, since you won't see half the network suddenly being turned off.