Why even have a game? We could just sit in our basements for four to six hours drinking and eating pretzels with friends.
Sounds like a date to me. My place or yours? *wink*
In reality though, I don't think 6 stats are too many or too few, I just think noone has ever bothered to balance them. The game basically relies on Dex and Int, everything else is essentially a dump stat at this point. Dex is both evasion and armor. It is statistically superior to meat. Intelligence is skills and knowledge, which will get you further than wisdom or charisma any day.
I'm playing 3.5 and FFG Star Wars right now and both use a 6-stat system. Though FFG Star Wars has combined Str and Con into Brawn, they added the "agility" of mental stats: Cunning. The biggest difference I've found is that it reads like FFG has made a much more resounding effort to include non-combat roles as viable options. To this end, almost every stat has 3 skills. Int gets several more, but typically any given class only gets a few of them, there is no "Lore Bard" or "Knowledge Cleric" who knows everything about everything.
Before D&D drops the 6-stat system, I'd like to see them do away with the "-10, divide by 2" system. Next up, they really need to rebalance the skills that use the stats in question. Either provide options like bringing back Endurance or allow for more customization like letting me use Str or Con for Athletics or letting me use Wis or Cha for my Will saves. If D&D does drop the number of stats is has (which it won't but for a thought exercise, lets go with it) it would be better off moving to a 3-stat system. "Brawn" for all the "RAWR ME STRONG!" sort of stuff covering both physical strength and physical meat. "Aptitude/Skill" for both physical and mental agility (Agi & Int) and "Personality" for Wis & Cha.
There's nothing wrong with a 6-Stat system. D&Ds problem is just that they're not making any real effort to balance things out to make less useful stats more useful and too-useful stats less useful. But that's what people want and frankly I think we'd get a reaction to any D&D that tried to do so much like we got to 4E; people
expect super-sneaks and CoDZilla from D&D. A D&D that doesn't provide that to them won't be seen as D&D.