As a general principle of law, once a manufacturer discovers a life threatening hazard or a defect in a product, the manufacturer has a post-sale duty to warn end-users of the product of the defect or hazard. See, e.g., Patton v. Hutchinson Wil-Rich Manufacturing Company, 861 P.2d 1299, 1315-16.
Clearly Lotus has known about this design flaw for some time but has decided to do nothing. It's only going to take one fatality/crash/mishap etc before the media jumps all over this story. This will go from New York Times automotive blog to New York Times front page. It's only a matter of time.
I have to say Lotus was very unsympathetic when I almost slid off the highway at 70mph when my passenger side oil line separated. This was after they had already repaired the driver side oil line several months earlier. All I got was the old "gee, sorry, these cars are known to do that."
In comparison: I had an early E36 BMW that had the water pump fail and the engine overheat several months after the warranty expired. With very little effort on my part BMW-NA offered to cover the cost of labor of replacing the water pump and the engine gaskets that had warped.
2005 Lotus Elise (Arctic Silver) Touring, LSS, Dual Oil Coolers, Stage II exhaust, Fujita Intake, Hardtop
2010 Ford Raptor SVT (Blue Flame Metallic) Stainless Works Exhaust, Roush intake
2005 Lotus Elise (Arctic Silver) Touring, LSS shocks, BWR sway bar, Cup Airbox, Stage II exhaust, QR steering rack - Sold