I was afraid it would come to this.....
Ok, lets take an example of a points per reception league (yes, in a non ppr league stud RB makes more sense at least in first round), out of the top 32 points producers you only have 7 RB's (Westbrook, LT, Addai, Peterson, Portis, Barber, and J. Lewis). Out of the same 32 there is 1- TE (Witten); 13 OB's (Brady, Romo, P Manning, TRoethlisberger, Brees, Anderson, Hasselbeck,Favre, Palmer, Kitna, Cutler, Warner, and McNabb): and 11 WR's (Moss, Owens, Wayne, Edwards, Houshmandzadeh, Fitz, Johnson, W. Walker, Colston, slipping in the parking lot Marshall, and T. Im old Holt).
Of the top 15 you only have two RB's--Westbrook with 358.5 pts, and LT with 326.85 pts. In the same top 15 you have 8 QB's and 5 WR's (Moss 357.30, Owens 307.00, Wayne 294.70, Edwards 289.20, and TJ Joushmandzadeh 282.20.
If I draft with say pick 12 of a 12 team draft I could get 2 of the top 5 WR's and then still be able to get a starting RB in a team that has a RBBC approach and then handcuff his partner with a later pick. For example, you can do this with two teams (say the Jets whom seem to be working hard on improving the offensive line, and CIN where both RB will be avaidable after the first two rounds). So pick three is a RB. Pick 4 you take a top 5 QB and from there you fill out your roster depending on number of players per position.
Granted injuries, and acending, and declining values of players will change who the top 15 of 2008 are (put guessing tihem is what makes fantasy football so fun) but I would be willing to make a wag (wild assed guess) that the list will once again be full of WR's and QB's not RB's.