You seem to be confusing the Evening MBA program at Kellogg with the new Saturday MBA program, rk4g63. They are two different programs.
I agree that the rigidity of the Saturday program is a weakness. I don't know if they will be offering more Saturday classes in the future or not. However, that doesn't necessarily imply that the quality of those classes is low. The classes are still at Kellogg, taught by Kellogg professors. I doubt the Admissions Office is going to risk seriously diluting the Kellogg brand by admitting weak students. Even now, the average GMAT for the Evening program is only slightly lower than for the Full-Time program, and the average Evening student has two more years of experience. It's not that easy to get in - so it's not just "giving them money in exchange for the Kellogg name." You do have to earn it.
I don't know what essays are required for the Saturday program - but I don't think "why the Saturday program?" is an unreasonable question given that Kellogg also has the Evening, Executive and Full-Time programs. It's a specific way of asking "Why Kellogg?" And as for essay length equaling the quality of the program or the commitment of the Admissions Office, consider Stern's part-time program. It's ranked #1 for part-time programs, yet it only asks for two 250 word essays and one creative essay up to 500 words. Short essays just force you to be clear and concise.
You have some legitimate reasons to criticize the new Saturday program, but your message is hard to take seriously when you are making such broad generalizations about the whole Kellogg part-time program.
ETA: You are, of course, welcome to disagree with me.
I just don't understand why you think the flexibility of a program affects the quality of the classes.