Those 10-12 battlegrounds are the purplest states, and they’re not eternal — every few cycles there’s a shift. California used to be a major battleground (until Gov Pete Wilson turned it solidly blue with his aggressively anti-Hispanic agenda), NY at one time (until the “real America” crusaders decided that only rural voters matter) — maybe if R’s gave a damn about cities again they could purple up some of the densely populated places.

As I’ve already stated, the rural states are already disproportionately weighted, as the country’s population move more and more into the cities, it would be a travesty to exponentially increase their weight. (unless you want all the states to go proportional — I’m sure liberals get at least 1/3 of the vote in each of those 3-EV states.)