Thing is, the motivating factor for NASCAR to form the commission that ultimately developed the Car of Tomorrow, was largely the death of Dale Earnhardt.
(By the way, what's the next iteration in this sequence? The Car of the day after tomorrow? Car of Friday after Next?)
Previous to Earnhardt's death, things like restrictor plates were introduced in NASCAR because speeds were getting absurd (220mph) on the bigger tracks and the wrecks were spectacular. People were dying and suffering major injuries. Changes were made under the guise of "good for racing" but for the most part it was fear and safety.
In nearly every case of a major NASCAR safety overhaul, the motivating factor was a death or some kind of major tragedy.
Plus, the shape and composition of a racing body has no effect on the manufacturers sales etc like a ball rollback would. Even though it's called a Ford Fusion, the "stock" car has absolutely nothing (no part, etc) in common with a Ford Fusion that a consumer buys save for the blue oval.
Essentialy, the COT is akin at this stage to implementing the "tournament ball" in a few tournaments this year, most of them next year, and all of them the year after that.
The model doesn't pan out, though, because the FECES does not require that golfers play in every or almost every event the way Nextel Cup does. One could conceivably avoid the events with the tournament ball (though ultimately the time would run out on this strategy).
Regarding death as a motivating factor, many would point to the "death" of Augusta National and other classic older layouts like Myopia and Cypress Point as reason enough to bring about change...but unfortunately that death is subjective whereas Earnhardt's is, sadly, far too objective.