I agree with the article in the link, but there are regulatory problems to consider.
Flying when known icing is forecast is something thousands of pilots have to do everyday. Doesn't mean they'll encounter ice, but they don't have the choice of staying on the ground if they want to stay employed. Now, should anything happen in regards to ice, and they happen to be flying a Cessna that used to be certified for ice, guess who FAA/EASA will nail? The pilots. They will lose their licenses and their livelihood, not the employer.