The proposal is quite simple: Unlock "10k tools" for a user once they have earned 15k across the SE network on all sites.
Obviously there is some question about joining enough sites to cause this to occur just from a random vantage point of "let me log in to every single site and get lots of reps" but that would require 200 * 1 + 100 * 148 = 149 SE sites for this to kick in. Since there aren't 150 sites and not likely to be in the near future, this means they would have to actively participate to some degree on many sites.
By the time you have participated on many sites in the network to reach 15k SEI wide, I should think that you would have a pretty decent understanding of the SE model in the first place.
PopularDemand raised the point "why do you want this" to which I answer:
Excellent point. I have heard MANY people suggest it, so thought that I would make a feature-request and see what the general feel of the community is. It certainly doesn't help me, because even with the 100 site bonus I'm nowhere near 15k SEIwide, and not likely to be anytime soon. Subtract the bonuses and I'm only around 6k