Personally, I don't think this is getting ahead of ourselves at all and that this issue is far more important than minutia like how many hit points a first level character should have, how wizards cast spells, or how saving throws work.  How the game is packaged will have the single most effect on whether I purchase it or not.  
I will not purchase a game that requires me to spend $100 on over 1,000 pages of rules to be able to run a relatively robust campaign. 
I will not purchase a crippleware product that gives me about 10 hours of game play and then requires me to spend $100 on over 1,000 pages of game rules to continue my campaign. 
I would happily purchase a product (or products) that allows me to run a fairly robust campaign with about 150 pages of rules (give or take 50).  Examples of the "density" of rules I'd be looking for would be the 1981 B/X rules, Tunnels & Trolls 5.5ed., Star Frontiers, Cthulhu Dark Ages, the first two Dragon Age boxed sets, and Savage Worlds Explorer's Edition.  You get the idea.  
If I like the game and play it, I will very happily purchase further supplements to the rules that I think will assist my campaign.