I'd reword it a little:
This stuff works!
Ok, show us!
No
please
No, it works
So... show us...
Ok, here's some of my guys trying to move me while I use it
They are hardly trying, show us against someone outside your group.
No.
This is easy to end, one of the folks that claims they can do it grabs a guy with a camera, heads over to the local university wrestling club and tries it out. Comes back, posts the video.
So why, with all of the people making these claims, has no one produced any evidence that it works by using it against the people they claim it will work against?
I have a feeling the results would be like that Pressure point group that got featured on a news program. There stuff stopped working on the reporter, and on the BJJ club they went to to try it out as part of the feature.
OK, I'm also reluctant to get involved in another argument that seems to be going in the direction of MMA/Modern vs. Traditional, but i'll see if I can put this a different way.
Rooting is important in traditional martial arts, and it has to do with proper stance training. I only wish my earlier instructors had pushed me harder with this. I am doing my best to make up for lost time.
Rooting gives you stability and makes all of your techniques more powerful, whether they be striking, blocking, or even standup type grappling and trapping techniques.
Rooting, all by itself, is not a silver bullet to stop all assailants. Rooting demonstrations are isolating the stance and the rooting, and simply showing what can be accomplished with it, as opposed to weak stances and poor root. But rooting, to have any usefulness, must be integrated into everything else that you do.
If one demonstrates rooting, void of anything else, a determined and/or strong and/or skilled grappler could of course cut under his base and throw him down. It would be more difficult than if one was not rooted, but nothing about rooting, all by itself, will magically prevent a grappler from toppling someone.
But good rooting, integrated into all other elements of the traditional arts, makes the traditional arts much more powerful. And this is often what is lacking today in traditional martial artists. These skills build the foundation, and without them, the rest of the art is shaky, even weak, even worthless if bad enough. But these skills take time, effort, dedication, and often don't show immediate results, so many people don't pursue them and simply write them off as fantasy, archaic, and useless.
You've got to see the whole picture, and understand how everything interacts and entwines the whole. To isolate something like rooting, and claim that a grappler could overcome this and therefor it is pointless, is a pointless argument.
I could also state that a double-leg takedown is useless. I could develop a strong defense against it, and every time you tried to do it to me, I could destroy you with my defense,
IF THAT IS ALL YOU WERE ALLOWED TO DO IN THE DEMONSTRATION.
But of course this isn't the only thing in grappling. It is only one element of the whole picture, and to isolate it, take it out of context, and make it a single, predictable technique, does nothing to convince anyone, including myself, that it is a worthless technique, when properly integrated into the whole system.