It's not the size that is the matter, but that it is shared with all other sports, expect basketball, even though football is the predominant user. To me, the lack of a football only weight room isn't the issue that some are making it out to be as IU's single weight is in the same ballpark as cumulative space at schools with separate football and all other sport weight rooms - OSU has a 17k sq ft football weight room and an 11k additional weight room - 3k more than IU, but OSU also sponsors 13 more varsity sports than IU.
Though I think another facility which includes a weight room would be a positive step.One thing to remember that most athletic department and non-football coaches offices are located in the NEZ. I think that another facility could be built to include non-football space: weight room, coaches offices, team meeting rooms, locker rooms. This would give football weight room bragging rights, and allow football support staff, which has grown significantly since the NEZ was built, to expand into more usable space. I think a good location would be directly south and perhaps attached to Mellencamp, with a tunnel connecting it to the NEZ.
Always room for improvement, I just don't think the current lack of the mentioned facilities indicates a lack of commitment to football.