That's what "the people" means, eh? I'd say that people meeting that classification include my wife (non-citizen female), brother (over 45), nieces & nephews (four under 17), parents (way over 45), along with a few hundred million other people who don't fall into your 15% category. You'll be hard pressed to explain why all of them have failed to "have otherwise developed sufficient connection with this country to be considerred part of that community."
I think you just flame-roasted your own argument there, RP.
Second, that 15% figure was a 1792 percentage -- it was Madison's estimate of the size of the militia. Given that blacks, women, and those as young as 18 are now allowed to vote, that percentage today is much higher.