If I recall, it was only 18 white WRs on NFL rosters last year and 16 the year before. From the growing pool of small schoolers entering the NFL and the success of white small schoolers like WR Marc Mariani and Danny Woodhead (at tailback) and more fan awareness of performance evaluations (with fantasy football helping)- this number should go up significantly this year I predict. I know this is a bold statement, but I predict around 30-35 white WRs this year (an average of around 1 per team) with all the talented white prospects this year.
Looking at the names mentioned in the pre-season thread- few of the white players aren't qualified to be on NFL rosters. At a quick glance I did, there looks to be only about 3-5 who aren't good enough to make some team in the league's roster by merit. Of course if 35 white WRs make it- the NFL will inflate the number of black OLs and QBs to keep things "balanced".
