It can be argued that baseball is the only sport that got it right from the outset, i.e. through the creation of an extensive minor league system as a proving ground for wouldbe major leaguers. College football, however, predated the advent of pro football by decades and, indeed, was initially rooted in Ivy League schools. Hence, it was philosophically predicated upon the "student-athlete" concept.
Personally, I have great respect for an athlete who struggles mightily just to maintain a 2.0 GPA, but I have no respect whatsoever for athletes who refuse to exert themselves academically. As much as I love Tennessee football, I love the University of Tennessee, my alma mater, more. UT and all of her peer institutions exist, first and foremost, as institutions of higher learning.
Intercollegiate athletics, on the other hand, provide a host of benefits to society. General Douglas MacArthur astutely declared that "On the fields of friendly strife are sown the seeds that on other days and other fields will bear the fruits of victory," an observation that our own beloved General Neyland would undoubtedly second. In the greater scheme of things, provision of training for a possible career in the NFL, by contrast, is distinctly secondary to a university's primary mission.