There's an article in today's (1/4) The Record by Ralph Russo of the A.P. on possible changes to the bowl system.
Based on the article, it appears that,in the future ,there may be a slight reduction in the overall number of bowls and the number of bowls a conference can lock in.
The lock in reduction is due in part to conferences not having a sufficient number of bowl eligible teams to fill all their bowl slots.
The article points out that there are a lot of people involved in college football who feel that all bowl eligible teams should be in a bowl.
This includes coaches who use the practice time for underclassmen player development.
One interesting point.
There's no mention of changing bowl eligibility to 7 wins.
Don't fool yourself, coaches also want Bowl games to pad resumes and collect five and six figure bonuses. Just think 15 years ago a legit Miami team sat at home at 10-1 with its one loss being a close one to an undefeated team. Now we get excited about getting to 6 wins. Heck, Grobe would have had three teams minimum go to Bowl games today.
I was merely pointing out what Mr.Russo's article said about people involved in college football,as it pertains to going to bowls.
No question the points you raised are valid.
Going to bowls is also a recruiting tool.