I would find it hard to believe that when the rules were being put together for LSA that the powers to be didn't have the likes of Cessna et al in the room if not to at least comment on their take on producing (cheaper) planes under the LSA regs. I firmly believe it wasn't, by the time the regs came out, a by product and I wouldn't be at all surprised to find that Cessna et al were a driving force behind the LSA regs.
You would be way wrong then my dear sir, and your beliefs unfounded.
LSA came about because the pt 103 "Training and Demonstration for Sale" provision was being abused by a minority percentage to take passengers and even haul rides for money. There was an operation out of Stockton CA that would haul rides off Lost Island (a boat up bar/island that's a major party spot in the summer) in the Delta, it was $25 for 15 minutes which, if it had actually been a demonstration for sale ride, would have been legal. Not sure how many sales that marketing program generated.... Many others were taking family and friends for rides in these higher power 2 seat variants of their proper 103 intended ultralight siblings. Well, as is wont to happen, people were getting killed. Now, all in all, the FAA could give a rats a$$ if you kill yourself. "Death by Misadventure" is a God given right and if it's not Constitutionally protected, it should be. Back in the day when you bought your Quicksilver for $2500 (that was with the HP 25hp Chrysler 2 stroke), spent a week assembling it, read the operations leaflet, put on your helmet and football pads and taught yourself to fly, the FAA was perfectly happy to let you to it, and in fact still is. Part 103 still exists in its intended form, personal flight in ultralight aircraft. I was 16 and nobody gave a crap and the old dudes on the bench at the airport would watch us and shake their heads, that was it. Lot's of people died, it was ok.
But then, passengers started getting killed, lawsuits happenned, Insurance Companies started paying out claims, Congress Critters received phone calls about how these expenses would eat into the funds available for campaign donations, and they got on the FAA. The FAA didn't really want to deal with this, they had been turning a blind eye to it. If you gave a winking at the letter of the rules they would do a Sgt Schultz. However, something else came up, International Standardization... This had been years in the progress, and aircraft certification is one of the standards subjects. While most of the world had a sub-certification, LSA type aircraft category, we did not. So we basically took the tenets of JAA LSA type and the input of the US light aviation community and created our S-LSA aircraft certification rules and SP Airman Certification process. I personally doubt that Cessna had much to say about it. With the R&D expense into this program it won't generate a profit for a long time. Most of what Cessna will get out of this program is a tax deduction to use against the profits on their jets, and some upgrade customers to their legacy aircraft.
When we adopted LSA and created the SP rules, the FAA was able to take the 2 seat exclusion out of 103, and if you wanted to take people up in your "fat ultralight", you had to get an SP certificate, and the instructors in them had to be CFI-SP or whatever they call it. Their aircraft also came under the most rudimentary of inspection and certification standards as E-LSA. Meeting that burden is not a great one since nearly anything even close to safe to fly will pass. LSA/SP killed 2 birds with one stone, an international mandate (which makes international certification of aircraft simpler), and got a sore out of their side by providing a solution to the "Fat Ultralight Passenger" issue with no real extra effort. They even threw a bone to the old codgers at the EAA and told them basically "You can fly till you die if you like" which made them happy...kinda... but have you ever seen a happy old man? Nah, me neither, they're always complaining about something, kids on the lawn, gubmint, gophers....whatever... They wanted to be able to fly their non LSA compliant aircraft until they failed a medical, then step down to an SP qualifying aircraft, but they didn't get that and it burns their butts.
The one thing the FAA DID NOT intend was to make aviation cheaper and more accessible. I don't know who dreamed that up, but that would be a negative consequnce to the FAA, it would mean more work. They didn't want more work except to make sure if you took an ultralight up with a passenger, you were certified to be safe in that type of aircraft. As far as the S-LSA, they're sooo hands off. They said "Use industry standards" even. But if they make them cheap and there are a lot of them, they will become a nuisance and create more work which means arguing with Congress for more money, and that cuts into coffee break time and may reduce the funds for the breakroom donuts.