I see nothing in this post that betrays a lack of basic business or economic knowledge, nor nothing in the disrespectful response that indicates greater understanding. Simply different perspectives and priorities.
Protecting the established clan via guaranteed entries has positive and negative effects. The Indy 500 became the most prestigious race on the planet using open qualification without any guaranteed spots. The many different sanctions and series that have taken part in the Indy 500 have always been and always will be secondary to that event. The IRL briefly locked in their teams as part of The Split, and it was...not well received. Not a good "business decision". While times have changed and there are different factors in play, there is no guarantee that locking in full-time IndyCar teams will benefit the race or the series long-term.
My personal preference as a compromise would be 2-3 series provisionals at the back of the grid, whether it be spots 31-33 or an added 34-36. If that were the case, mediocre IndyCar teams wouldn't enter the month of May locked in with no real stakes. If nothing else, the illusion of meaningful bumping would be preserved, but it would be nearly impossible for an elite team to miss. I would think Penske / Andretti / Ganassi would be all over that.