AbdulAlhazred
Legend
Well first there is more than one game for "those people" just check out the numerous retro-clones being produced, sold and played. I love Dungeon Crawl Classics and it is exactly this type of game which in turn leads to my second point...
I'm not so sure you're correct in thinking that the majority or at least a substantial segment of roleplayers don't enjoy and/or still play in this style or with these types of games. IMO, the designer's of 4e made this same assumption and I think the game eventually suffered in appeal and popularity because of it. YMMV of course.
How would you then explain the popularity of 3.x and now Pathfinder? 4e is most certainly a game oriented towards RP and detailed characters with strong input from players, much like its immediate d20 predecessors, and not like OD&D or 'OSR' type games in general. Clearly it would appear that this 'assumption' is not so bad after all. Frankly the whole history of D&D has been a constant push by players to have more options and more 'stuff' in general. I think it would be a mistake to believe that general direction has changed. In fact the overriding theme with 4e all along was griping about how it didn't have this or didn't have that, and the whole release schedule can be seen as WotC's understanding that without as much stuff as 3.5 had 4e was at a disadvantage.
I don't disagree that OSR exists, and that SOME ASPECTS of the game can be better enjoyed by some players when they are simpler, but even those players always have a hunger for more and more material. 'heavy' games with lots of options like 3.x and 4e, PF, 13a, etc will continue to be the rule IMHO. It is a matter of publishers controlling expectations and managing the material so that they can produce something playable even after it has had 100 different supplements.
In any case this is totally tangential, so if you want to discuss it more feel free to start another thread.